... : carbon steelRoller material: nylonProduct Feature:1.Low coefficient of product,reduce tire damage 2.Running smoothly and durable. ... : natural color, green, orange, blue, grey, milky white, porcelain white etcProduct Series:60,62,69,68,6000series, and non-standard ... .Roller:all kinds of rollersApplication:This kind of roller is suitable for shower room,wardrobes,big cabins,sliding doors and windows ...