1.LSB specially produce the o-ring,x-ring.rubber parts 2. Material: FFKM,NBR, HNBR,EPDM,SI ... extinguishers ,Refrigeration Compressor in air conditioning, etc.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 and accessories,compression mold , ... ,but o-ring's mold fee is free. industrial rubber oil ring