LSB specially specialize in produce the rubber productions, O ring, X ring, and some other rubber parts. 1. material:NBR,EPDM ... 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, ... Seal Test Bed,Rubber Brittle Low-Temperature Test Bed, Aging Test, Thickness Meter, Shore-A Hardness Tester, Optical Projector rubber pump seal