Caster: We produce varied casters in Nylon, P.U., Nylon-TPR, rubber and Iron with different sizes. Pls contact us for details if you are interested. Features - Heavy duty, impact-resistant caster features cushion rubber tread bonded to a cast iron core - Material can choose Nylon, P.U. Nylon-TPR, Rubber and Iron. Usage - Works on rough, chip littered floors, oil, and grease. - Won't crack with a heavy load. Perfect for automotive shops.