1.LSB specially produce the o-ring,x-ring.rubber parts 2. Material: FFKM,NBR, HNBR,EPDM,SI,FKM( ... 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 ... and color can be make on your requirement ,but o-ring's mold fee is free. industrial rubber oil ...