1.LSB specially produce the o-ring,x-ring.rubber parts 2. Material: FFKM,NBR, HNBR,EPDM,SI,FKM(VITON)CR,PU, ... PTFE,ACR(A) 1. Material:NBR,EPDM,SI,FKM(V270M),CR,SBR,IIR,HNBR,ACM ... Y-Ring.U-Ring., Oil Seal,PU oil seals , rubber flat washers, rubber Circles, Gaskets, engine parts and accessories,compression mold , etc ... ,but o-ring's mold fee is free. industrial rubber oil ring