Material: NBR,EPDM,ACM,SILICONE rubber,HNBR Characteristic: oil ,high/low temperture,ozone resistant... Quality certificate: ISO/TS 16949:2002Material: NBR,EPDM,ACM,SILICONE rubber,HNBRCharacteristic: oil ,high/low temperture,ozone resistant...Oem are welcome O-ring