... caster 5.running smoothly Specification :Model No. R625zz bearing roller Roller Material:nylonBearing Material:carbon steel Size: 5*23*7mm colour ... : black application :They are suitable for bathroom,hang roller, sliding door &window,table, and other furnitures etc.product ... 1.Bearing Material:carbon,chrome,stainless steel,iron,ect.2.Roller Material:POM,nylon,glass fiber,etc3.OEM and non- ...