... -standard bearing and injection molding roller and dysmorphism parts . Our products with advanced equipment,mature techniques and with high precision, low noise, ... 1.Bearing Material:carbon,chrome,stainless steel,iron,ect.2.Roller Material:POM,nylon,glass fiber,etc3.OEM and non- ... ZZ ,Z ,RS,OPEN (metal or nylon)5.colour: natural color, grren, orange, blue, grey, milky white, porcelain white etcSeries: ...