It's made of high quality low-carbon steel plate, sintered CuPb10Sn10 tin-bronze alloy as its surface. To effectively decrease abrasion, its alloy surface can be machined with ball shaped oil sockets or oil grooves for easier oil storage. If necessary, tin or copper can be plated on the steel backing. It can be applied in mediate load with mediate or high running velocity and conditions with enormous impact load.