Tilt Truck:Sturdy, plastic construction. Smooth and seamless, one-piece molded truck bodies with reinforced lip are rounded and easy to clean. 4" center swivel back caster provides easy maneuvering. Durable, one-piece, 10" blow-molded polypropylene wheels offer low maintenance and protect surroundings. Powder coated steel frame for corrosion resistance.(Cannot ship UPS.) Sold by the each.