It is backed with high quality low carbon steel with tin-lead-bronze alloy (CuSn4Pb24) sintered on its surface. To effectively decrease abrasion, its alloy surface can be machined with oil grooves for easier oil storage. When necessary, an erosion protection coating can be plated on the steel back. In common use, DYB 302 is made to wrapped bushes, thrust washer and bushes on connecting rod level of gas engine, etc.