... Material are :FFKM,NBR, HNBR,EPDM,SI,FKM(VITON)CR,PU,PTFE,ACR(A) 1. material:NBR,EPDM,SI,FKM(V270M ... ),CR,SBR,IIR,HNBR,ACM,FLS,AFLAS ,PU ,etc2. Application:cars,Bath,Gate,Hydropneumatic,Electronics,Powertools,Fire , ... -Ring V-Ring.R-Ring. Y-Ring.U-Ring., Oil Seal,PU oil seals , rubber flat washers, rubber Circles, Gaskets, engine parts ... o-ring's mold fee is free. KTW standard rubber seal