... technology production Material Option:1.Bearing Material:carbon steel,chrome,stainless steel,iron,copper,ect.2.Roller Material:POM,nylon ... .Our superiorities: 1.Yuan Cheng is a one-stop supplier of miniature bearings and rollers, which is the industry ... produce miniature deep groove ball bearing or carbon steel, bearing steel, stainless steel, non-standard bearing and injection molding roller and ...