1,PTFE with lead 0.01-0.03mm 2,Porous bronze 0.2-0.3mm 3,Steel backing 0.7-2.3mm 4,Tin palting or copper plating 0.008mm INTRODUCTION1,Steel backing,sintered porous bronze, PTFE layer2,Small rubbing coefficient,wear-resisting and corrode resisting.3,Long using time.4,Reduce the cost of machine, reducing noises and negligible stick-slip.5,It is widely used in printing machine, wearing machine, ...