Seal, Seal Strip, O Ring, PU Ring, PU Strip, PU Piston, Buffering Pad, Y Shape Seal, Irregular ... .Four,long service life.Material:Viton , EPDM,NBR,FFKM,VMQ,PTFE,PU and so on (according to your requirements )Operation conditions ... :Pressure:<=50MPaTemperature:-30°C ~ 200°C rubber O ring cord, PU O ...