Feature:1. O-ring double seal seals and prevents water leaks in faucets, sinks, filters, and machinery.2. Soft rubber construction enhances durability for long-term use in static and dynamic cylinder fittings.3. Made from commercial grade nitrile rubber (NBR) material to withstand UV rays, lubricants and greases.4. Suitable for home, hydraulic, industrial and pneumatic applications.5. A variety of O rings are in the plastic storage boxes with dividers and cover.Specification:Item Type:O RingShape:RingMaterial:Rubber.Package List:20PCS 5.29x1.78 mm O-Ring20PCS 6.07x1.78 mm O-Ring20PCS 6.8x1.9 mm O-Ring20PCS 7.65x1.78 mm O-Ring20PCS 7.8x1.9 mm O-Ring20PCS 8x2 mm O-Ring20PCS 8.8x1.9 mm O-Ring15PCS 10.82x1.78 mm O-Ring15PCS 10.77x2.62 mm O-Ring15PCS 11x2 mm O-Ring15PCS 12x2 mm O-Ring10PCS 13.9x1.8 mm O-Ring10PCS 13.95x2.62 mm O-Ring10PCS 14x2 mm O-Ring10PCS 15x2 mm O-Ring10PCS 17x2 mm O-Ring10PCS 17.17x1.78 mm O-Ring10PCS 17.04x3.53 mm O-Ring