... o rings, rubber gaskets, washer, custom rubber Material: nbr, epdm,silicone... More than 1500 o ring sizes O ring is one ... our factory, it is made from Nitrile(NBR), HNBR ,EPDM, Silicone, Fluorine(FKM,FPM), Neoprene(CR),Styrene(SBR) ,CR,ACM,PU ... us to provide goods to customer in the exact performance. Clear silicone ring