1.LSB specially produce the o-ring,x-ring.rubber parts 2. Material: FFKM,NBR, HNBR,EPDM,SI, ... Y-Ring.U-Ring., Oil Seal,PU oil seals , rubber flat washers, rubber Circles, Gaskets, engine parts and accessories,compression mold , ... ,DIN3771,JIS B2401,ISO3601,BS1806.8. accept sample or product drawing on your size9. Different sizes and color can ... ,but o-ring's mold fee is free. industrial rubber oil ring