... Bearing material: carbon steelProduct Feature:1.Low coefficient of product,reduce tire damage 2.Running smoothly and durable.3.Poduct ... 2RS ZZ ,Z ,RS,OPEN (metal or nylon)4.Colour: natural color, green, orange, blue, grey, milky white, porcelain white ... injection molding roller and dysmorphism parts. Our product with advanced equipment, mature techniques and with high precision, low noise, long-life and ...