... :Silicone,NR,NBR,SBR,EPDM,CR,TPE,PVR,PC,PE,PP,PS,POM,PUR,PVC,PPTV,HIPS,ABS,EPE, ... REACH,UL and RoHS approval3)All manufacturing processes confirm to the ISO-9001,RoHS and REACH standards4)Excellent chemical and ... ringsFront Hub Bolt O-RingFront Main SealRear Main Seal (The rear main seal may change color with out notice)Crank ... enigine for race tolerances and performance. o ring manufacturer in China