22 pcs rubber O ring: 12 pcs 9 x 2 x 5mm & 10 pcs 8 x 2 x 4mmThis oil seal O ring is made of rubber material, round cross-section, easy to install.Applications: automotive, electrical appliances, mechanical, industrial, construction, household and other fields.Product Name: O RingMaterial: rubberColor: BlackOuter diameter (approx.): 9 mm / 0.35inch & 8mm / 0,31 inchesInner diameter (approx.): 5 mm/0.2inch & 4mm / 0.16 inchesThickness (approx.): 2 mm / 0.078 inchPackage Contents:22 x rubber O ringOnly the above package content, other products are not included.Note: Light 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.