... ,stainless steel,iron,copper,ect.2.Roller Material:POM,nylon,glass fiber,etc3.Sealing from:2RS ZZ ,Z ,RS,OPEN (metal ... ,on time delivery.Our superiorities: 1.Yuan Cheng is a one-stop supplier of miniature bearings and rollers, which is the ... experience in manufacturing bearings, emphasis on commitment, focus on quality, the pursuit of high-quality cost-effective. 3, We have advanced equipment and ...