... :carbon steel,chrome,stainless steel,iron,copper,ect.2.Roller Material:POM,nylon,glass fiber,etc3.Sealing from:2RS ... 6000series, and non-standard bearing series,toy bearing series and sport equipment series.Roller:all kinds of rollersApplication:This kind of ... steel, stainless steel, non-standard bearing and injection molding roller and dysmorphism parts. Our product with advanced equipment, mature ...