... and functional: 4.high-precision caster 5.running smoothly Specification :Model No. R625zz bearing roller Roller Material:nylonBearing Material:carbon ... black application :They are suitable for bathroom,hang roller, sliding door &window,table, and other furnitures etc.product feature:1. ... Bearing Material:carbon,chrome,stainless steel,iron,ect.2.Roller Material:POM,nylon,glass fiber,etc3.OEM and ...