1. LSB specially produce the o-ring,x-ring.rubber parts 2. Material: FFKM,NBR, HNBR,EPDM,SI,FKM ... .3. Main products: O-Ring.X-Ring V-Ring.R-Ring. Y-Ring.U-Ring., Oil Seal,PU oil seals , rubber flat washers, rubber Circles, Gaskets, engine parts ... Rotary Oil Seal Test Bed,Rubber Brittle Low-Temperature Test Bed, Aging Test, Thickness Meter, Shore-A Hardness Tester, Optical Projector rubber y shape ring