... :square ring rubber O-Ring is a kind of sealing products which is usually made of springing material and through ... the molding way to make it in the ring ship. It is generally ... ring rubberMaterialNBR,HNBR,EPDM,SILICONE,VITON,NR,CR,SBR,PUHardness30-100 shore ASizeCustomized/standard/nonstandardColorRed, Black, White, Clear, etcTemperatureCommon: ...