ITEM NAME:12 x 7.5 mm 2.0 mm Thickness Rubber O-Ring Oil Seal Seals W2A3 12 x 7.5 mm 2.0 mm Thickness Rubber O-Ring Oil Seal Seals W2A3 Product Name: O Ring; Material: Rubber Weight: 2 G Outer diameter (approx.): 7.5 mm / 0.74 cm; Inner diameter (approx.): 3.5 mm / 0.36 cm (approx.) Thickness: 2 mm / 0.2 cm, Color: black Package contents: 12 x rubber O ring Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Thickness: 2 mm / 0.2 cm, Color: black.