1. LSB specially produce the o-ring,x-ring.rubber parts 2. Material: FFKM,NBR, HNBR,EPDM,SI,FKM ... 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 ... color can be make on your requirement ,but o-ring's mold fee is free.Company Name: Best ... Test, Thickness Meter, Shore-A Hardness Tester, Optical Projector ptfe mechanical ring seal