Catalogue

Expand all | Collapse all | Show hidden lines

  • Banner

ELRING 355.940 Seal Ring

355.940
£0.00
Tax included
Quantity
Out-of-Stock

  Security policy

(edit with the Customer Reassurance module)

  Delivery policy

(edit with the Customer Reassurance module)

  Return policy

(edit with the Customer Reassurance module)

Product Details
ELRING
355.940
New product

Data sheet

Inner diameter [mm]
7,59
Outer diameter [mm]
12,83
Thickness [mm]
2,62
Shape
O-Ring
Material
FPM (fluoride rubber)
New product
100 other products in the same category:
ELRING 940.640 Seal Ring Quick view

Reference: 940.640

Brand: ELRING

ELRING 940.640 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 811.090 Seal Ring Quick view

Reference: 811.090

Brand: ELRING

ELRING 811.090 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 586.676 Seal Ring Quick view

Reference: 586.676

Brand: ELRING

ELRING 586.676 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 540.900 Seal Ring Quick view

Reference: 540.900

Brand: ELRING

ELRING 540.900 Seal Ring

Material : ACM (Polyacrylate), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 022.851 Seal Ring Quick view

Reference: 022.851

Brand: ELRING

ELRING 022.851 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 562.939 Seal Ring Quick view

Reference: 562.939

Brand: ELRING

ELRING 562.939 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 592.370 Seal Ring Quick view

Reference: 592.370

Brand: ELRING

ELRING 592.370 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 237.744 Seal Ring Quick view

Reference: 237.744

Brand: ELRING

ELRING 237.744 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 133.868 Seal Ring Quick view

Reference: 133.868

Brand: ELRING

ELRING 133.868 Seal Ring

Required quantity : 2, Material : Rubber with ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 326.470 Seal Ring Quick view

Reference: 326.470

Brand: ELRING

ELRING 326.470 Seal Ring

Material : PTFE (polytetrafluoroethylene)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 843.680 Seal Ring Quick view

Reference: 843.680

Brand: ELRING

ELRING 843.680 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 582.890 Seal Ring Quick view

Reference: 582.890

Brand: ELRING

ELRING 582.890 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 009.360 Seal Ring Quick view

Reference: 009.360

Brand: ELRING

ELRING 009.360 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 332.480 Seal Ring Quick view

Reference: 332.480

Brand: ELRING

ELRING 332.480 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 008.354 Seal Ring Quick view

Reference: 008.354

Brand: ELRING

ELRING 008.354 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 524.215 Seal Ring Quick view

Reference: 524.215

Brand: ELRING

ELRING 524.215 Seal Ring

Supplementary Article/Info 2 : with mounting ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 447.020 Seal Ring Quick view

Reference: 447.020

Brand: ELRING

ELRING 447.020 Seal Ring

Shape : O-Ring, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 925.970 Seal Ring Quick view

Reference: 925.970

Brand: ELRING

ELRING 925.970 Seal Ring

Shape : A-shape, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 406.210 Seal Ring Quick view

Reference: 406.210

Brand: ELRING

ELRING 406.210 Seal Ring

Shape : A-shape, Material : Sheet Steel, Inner ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 693.162 Seal Ring Quick view

Reference: 693.162

Brand: ELRING

ELRING 693.162 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 210.294 Seal Ring Quick view

Reference: 210.294

Brand: ELRING

ELRING 210.294 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 897.690 Seal Ring Quick view

Reference: 897.690

Brand: ELRING

ELRING 897.690 Seal Ring

Material : PTFE (polytetrafluoroethylene)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 505.100 Seal Ring Quick view

Reference: 505.100

Brand: ELRING

ELRING 505.100 Seal Ring

Supplementary Article/Info 2 : with mounting ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 760.463 Seal Ring Quick view

Reference: 760.463

Brand: ELRING

ELRING 760.463 Seal Ring

Shape : O-Ring, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 375.710 Seal Ring Quick view

Reference: 375.710

Brand: ELRING

ELRING 375.710 Seal Ring

Shape : O-Ring, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 012.180 Seal Ring Quick view

Reference: 012.180

Brand: ELRING

ELRING 012.180 Seal Ring

Material : ACM (Polyacrylate), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 128.250 Seal Ring Quick view

Reference: 128.250

Brand: ELRING

ELRING 128.250 Seal Ring

Fitting Position : Left, Material : ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 493.330 Seal Ring Quick view

Reference: 493.330

Brand: ELRING

ELRING 493.330 Seal Ring

Material : PTFE (polytetrafluoroethylene)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 222.620 Seal Ring Quick view

Reference: 222.620

Brand: ELRING

ELRING 222.620 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 453.920 Seal Ring Quick view

Reference: 453.920

Brand: ELRING

ELRING 453.920 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 198.500 Seal Ring Quick view

Reference: 198.500

Brand: ELRING

ELRING 198.500 Seal Ring

Shape : O-Ring, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
DELCO REMY 19025674 Seal Ring Quick view

Reference: 19025674

Brand: DELCO REMY

DELCO REMY 19025674 Seal Ring

for OE number : .........,.,.,,..,

(0)

Price £0.00
More
Out-of-Stock
ELRING 777.471 Seal Ring Quick view

Reference: 777.471

Brand: ELRING

ELRING 777.471 Seal Ring

Material : ACM (Polyacrylate), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 522.880 Seal Ring Quick view

Reference: 522.880

Brand: ELRING

ELRING 522.880 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 492.060 Seal Ring Quick view

Reference: 492.060

Brand: ELRING

ELRING 492.060 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 023.290 Seal Ring Quick view

Reference: 023.290

Brand: ELRING

ELRING 023.290 Seal Ring

Material : ACM (Polyacrylate), Height [mm] : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 237.752 Seal Ring Quick view

Reference: 237.752

Brand: ELRING

ELRING 237.752 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 065.490 Seal Ring Quick view

Reference: 065.490

Brand: ELRING

ELRING 065.490 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 900.030 Seal Ring Quick view

Reference: 900.030

Brand: ELRING

ELRING 900.030 Seal Ring

Shape : O-Ring, Material : NBR (nitrile ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 278.386 Seal Ring Quick view

Reference: 278.386

Brand: ELRING

ELRING 278.386 Seal Ring

Shape : O-Ring, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 123.005 Seal Ring Quick view

Reference: 123.005

Brand: ELRING

ELRING 123.005 Seal Ring

Shape : A-shape, Material : Copper, Inner ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 127.610 Seal Ring Quick view

Reference: 127.610

Brand: ELRING

ELRING 127.610 Seal Ring

Material : FPM (fluoride rubber)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 751.610 Seal Ring Quick view

Reference: 751.610

Brand: ELRING

ELRING 751.610 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 559.030 Seal Ring Quick view

Reference: 559.030

Brand: ELRING

ELRING 559.030 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 046.264 Seal Ring Quick view

Reference: 046.264

Brand: ELRING

ELRING 046.264 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 518.158 Seal Ring Quick view

Reference: 518.158

Brand: ELRING

ELRING 518.158 Seal Ring

Shape : O-Ring, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 322.415 Seal Ring Quick view

Reference: 322.415

Brand: ELRING

ELRING 322.415 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 707.460 Seal Ring Quick view

Reference: 707.460

Brand: ELRING

ELRING 707.460 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
DELCO REMY 1876805 Seal Ring Quick view

Reference: 1876805

Brand: DELCO REMY

DELCO REMY 1876805 Seal Ring

for OE number : ..........,,,,...., Weight [g] : 1

(0)

Price £0.00
More
Out-of-Stock
ELRING 750.450 Seal Ring Quick view

Reference: 750.450

Brand: ELRING

ELRING 750.450 Seal Ring

Shape : O-Ring, Material : ACM (Polyacrylate), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 008.592 Seal Ring Quick view

Reference: 008.592

Brand: ELRING

ELRING 008.592 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 398.420 Seal Ring Quick view

Reference: 398.420

Brand: ELRING

ELRING 398.420 Seal Ring

Material : FPM (fluoride rubber)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 766.402 Seal Ring Quick view

Reference: 766.402

Brand: ELRING

ELRING 766.402 Seal Ring

Material : FPM (fluoride rubber)

(0)

Price £0.00
More
Out-of-Stock
ELRING 294.683 Seal Ring Quick view

Reference: 294.683

Brand: ELRING

ELRING 294.683 Seal Ring

Material : FPM (fluoride rubber)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 348.376 Seal Ring Quick view

Reference: 348.376

Brand: ELRING

ELRING 348.376 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 906.050 Seal Ring Quick view

Reference: 906.050

Brand: ELRING

ELRING 906.050 Seal Ring

Material : ACM (Polyacrylate), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 314.994 Seal Ring Quick view

Reference: 314.994

Brand: ELRING

ELRING 314.994 Seal Ring

Material : FPM (fluoride rubber)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 263.470 Seal Ring Quick view

Reference: 263.470

Brand: ELRING

ELRING 263.470 Seal Ring

Shape : O-Ring, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 019.364 Seal Ring Quick view

Reference: 019.364

Brand: ELRING

ELRING 019.364 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 569.120 Seal Ring Quick view

Reference: 569.120

Brand: ELRING

ELRING 569.120 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
DELCO REMY 1974687 Seal Ring Quick view

Reference: 1974687

Brand: DELCO REMY

DELCO REMY 1974687 Seal Ring

for OE number : ........,.,...,,,,

(0)

Price £0.00
More
Out-of-Stock
ELRING 587.460 Seal Ring Quick view

Reference: 587.460

Brand: ELRING

ELRING 587.460 Seal Ring

Material : FPM (fluoride rubber)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 155.560 Seal Ring Quick view

Reference: 155.560

Brand: ELRING

ELRING 155.560 Seal Ring

Material : PTFE (polytetrafluoroethylene)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 321.508 Seal Ring Quick view

Reference: 321.508

Brand: ELRING

ELRING 321.508 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 296.620 Seal Ring Quick view

Reference: 296.620

Brand: ELRING

ELRING 296.620 Seal Ring

Colour : Green, Shape : O-Ring, Material : FPM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 104.229 Seal Ring Quick view

Reference: 104.229

Brand: ELRING

ELRING 104.229 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 714.800 Seal Ring Quick view

Reference: 714.800

Brand: ELRING

ELRING 714.800 Seal Ring

Material : PTFE (polytetrafluoroethylene), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 924.560 Seal Ring Quick view

Reference: 924.560

Brand: ELRING

ELRING 924.560 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 440.760 Seal Ring Quick view

Reference: 440.760

Brand: ELRING

ELRING 440.760 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 381.710 Seal Ring Quick view

Reference: 381.710

Brand: ELRING

ELRING 381.710 Seal Ring

Fitting Position : Right, Material : FPM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 105.457 Seal Ring Quick view

Reference: 105.457

Brand: ELRING

ELRING 105.457 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 283.170 Seal Ring Quick view

Reference: 283.170

Brand: ELRING

ELRING 283.170 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 278.000 Seal Ring Quick view

Reference: 278.000

Brand: ELRING

ELRING 278.000 Seal Ring

Material : PTFE (polytetrafluoroethylene)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 518.166 Seal Ring Quick view

Reference: 518.166

Brand: ELRING

ELRING 518.166 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 508.608 Seal Ring Quick view

Reference: 508.608

Brand: ELRING

ELRING 508.608 Seal Ring

Material : FPM (fluoride rubber)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 351.180 Seal Ring Quick view

Reference: 351.180

Brand: ELRING

ELRING 351.180 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 456.070 Seal Ring Quick view

Reference: 456.070

Brand: ELRING

ELRING 456.070 Seal Ring

Shape : O-Ring, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 106.305 Seal Ring Quick view

Reference: 106.305

Brand: ELRING

ELRING 106.305 Seal Ring

Shape : A-shape, Material : Copper, Inner ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 538.120 Seal Ring Quick view

Reference: 538.120

Brand: ELRING

ELRING 538.120 Seal Ring

Shape : O-Ring, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 705.070 Seal Ring Quick view

Reference: 705.070

Brand: ELRING

ELRING 705.070 Seal Ring

Shape : C-Shape, Material : Steel, Inner ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 714.500 Seal Ring Quick view

Reference: 714.500

Brand: ELRING

ELRING 714.500 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 374.360 Seal Ring Quick view

Reference: 374.360

Brand: ELRING

ELRING 374.360 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 097.500 Seal Ring Quick view

Reference: 097.500

Brand: ELRING

ELRING 097.500 Seal Ring

Material : ACM (Polyacrylate), Height [mm] : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 104.302 Seal Ring Quick view

Reference: 104.302

Brand: ELRING

ELRING 104.302 Seal Ring

Shape : A-shape, Material : Copper, Inner ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 736.810 Seal Ring Quick view

Reference: 736.810

Brand: ELRING

ELRING 736.810 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 201.200 Seal Ring Quick view

Reference: 201.200

Brand: ELRING

ELRING 201.200 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 966.070 Seal Ring Quick view

Reference: 966.070

Brand: ELRING

ELRING 966.070 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 928.510 Seal Ring Quick view

Reference: 928.510

Brand: ELRING

ELRING 928.510 Seal Ring

Material : ACM (Polyacrylate), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 649.860 Seal Ring Quick view

Reference: 649.860

Brand: ELRING

ELRING 649.860 Seal Ring

Shape : A-shape, Material : HNBR (hydrogenated ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 244.694 Seal Ring Quick view

Reference: 244.694

Brand: ELRING

ELRING 244.694 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 534.680 Seal Ring Quick view

Reference: 534.680

Brand: ELRING

ELRING 534.680 Seal Ring

Material : ACM (Polyacrylate), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 742.950 Seal Ring Quick view

Reference: 742.950

Brand: ELRING

ELRING 742.950 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 715.450 Seal Ring Quick view

Reference: 715.450

Brand: ELRING

ELRING 715.450 Seal Ring

Shape : O-Ring, Material : NBR (nitrile ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 505.090 Seal Ring Quick view

Reference: 505.090

Brand: ELRING

ELRING 505.090 Seal Ring

Fitting Position : Right, Material : ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 302.820 Seal Ring Quick view

Reference: 302.820

Brand: ELRING

ELRING 302.820 Seal Ring

Shape : O-Ring, Material : FPM (fluoride ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 309.028 Seal Ring Quick view

Reference: 309.028

Brand: ELRING

ELRING 309.028 Seal Ring

Material : FPM (fluoride rubber)/ACM ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 325.503 Seal Ring Quick view

Reference: 325.503

Brand: ELRING

ELRING 325.503 Seal Ring

Material : NBR (nitrile butadiene rubber), ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 247.380 Seal Ring Quick view

Reference: 247.380

Brand: ELRING

ELRING 247.380 Seal Ring

Material : MVQ (Silicone Elastomer), Dust ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 587.966 Seal Ring Quick view

Reference: 587.966

Brand: ELRING

ELRING 587.966 Seal Ring

Material : FPM (fluoride rubber), Dust Cover : ...

(0)

Price £0.00
More
Out-of-Stock
ELRING 901.260 Seal Ring Quick view

Reference: 901.260

Brand: ELRING

ELRING 901.260 Seal Ring

Material : PTFE (polytetrafluoroethylene)/ACM ...

(0)

Price £0.00
More
Out-of-Stock

Follow us on Facebook

Facebook