... c) Excellent oil resistance d) Anti-aging, good flexibility, NameRubber O ringsMaterialNBR,NR,EPDM,SILICONE,FKM,CR,BR,SBR,HNBRCertificationISO 9001 ... :2008 ISO 14001:2004Passd inspections of SGS, PONY, INTERTEK, CTI, etcEnvironmental Complaince ROHS,REACH,etc Size CustomizeColorBlack or ... to your Requirement2.Designs and Specification are Accepted LIXIN rubber O rings