It's made of tin-bronze plate, sintered porous bronze as its interlayer and the compound of PTFE material and PB as its surface. It can offer the properties of good self-lubricating anti-abrasion, low-friction, fully develop the advantages of metal and multi-element polymer. It's used in steel metallurgical industry, such as those used in roller grooves of successive casting machines, cement grout pump and spiral conveyers for cement etc.