... .Roller Material:POM,nylon,glass fiber,etc3.Sealing from:2RS ZZ ,Z ,RS,OPEN (metal or nylon)4.Colour: ... 60,62,69,68,6000series, and non-standard bearing series,toy bearing series and sport equipment series.Roller:all kinds of ... , which is mainly produce miniature deep groove ball bearing or carbon steel, bearing steel, stainless steel, non-standard bearing and injection molding roller and dysmorphism ...