ITEM NAME:10Pcs/set SF-1 Bronze Bushing Bearing 10mm x 12mm x Bush Sleeve Motor C3R5 C0B6 Description&Preview.10x SF-1 Bearing Bushing. Low carbon steel Increase the carrying capacity of the bearing and heat transfer effects. With good load capacity and wear resistance pefermance. Material: low carbon steel+oil impregnated Bronze.