... Material:nylonBearing Material:carbon steel Size: 5*22.5*7mm colour: yellow application :They are suitable for bathroom,hang roller, sliding ... technology productionMaterial Option:1.Bearing Material:carbon,chrome,stainless steel,iron,ect.2.Roller Material:POM,nylon,glass fiber,etc3.OEM ... from:2RS ZZ ,Z ,RS,OPEN (metal or nylon)5.colour: natural color, grren, orange, blue, grey, milky white, porcelain ...