1. LSB specially produce the o-ring,x-ring.rubber parts 2. Material: FFKM,NBR, ... , etc.3. Main products: O-Ring.X-Ring V-Ring.R-Ring. Y-Ring.U-Ring., Oil Seal,PU oil seals , ... make on your requirement ,but o-ring's mold fee is free.Company Name: Best ... Ring Technology Co. , Ltd. Business Type: Manufacturer ... -A Hardness Tester, Optical Projector rubber y shape ring