O-Ring, Oil Seal, Gasket, U-Ring, Quad-Ring, Glyd-Ring, Step Seal, Mechanical Seal, Extrusion Seals, Rotating Seals and wearable 1. All rubber products are made according to international standard: ISO 3601, AS 568A, DIN3771, JIS B2401. 2. Widely uses in the tire, shoe industry, adhesive plaster industry and the conveyor belt and so on3. Various materials and hardness for your option, including ...