... meet ISO3302-1:1996 M1 High precisionAvailable material: NBR, EPDM, Silicone, HNBR, FKM, FLS, SBR, CR, ACM, NR.Color: ... which is usually made of springing material and through the molding way to make it in the ring ship. It ... ,FPM (VITON) , MVQ (SILICONE) , ACM ,EPDM ,PTFEHNBR ,automobile, motorcycyles, agricultural machinery ,trucks buses,trailers,eavy duty machine ,pump andother euquipment .between ...