... Professional manufacturer 2. Sinter Oilless Self-lubrication Bearing Hefei Bolin Advanced Materials Co., Ltd is ... powder metallurgy parts. The sinter oilless self-lubrication bearing are widely used in automobile, motorcycle, power ... me for more information, thanks!Feature of copper base bearing:1. Chemical composition: copper, tin, graphite, other2 ... with you! Sinter Oilless Self-lubrication Bearing