12" x 3" Polyon Cast Wheel - 3500 lbs. Capacity12" x 3" Polyon Cast Wheel Polyurethane elastomer tread chemically bonded to a cast iron core. These wheels are somewhat heavy and are ideal for warehouses with concrete and hardwood flooring. Tread: Polyurethane Elastomer Core: Cast Iron Core Bearing: Roller Bearing and Plain Bore Capacity: 3,500 Lbs. Color: Green and Black Durometer: Shore A 95 (+ 5) Temperature Range: 40 F to 180 F Load Capacity 3,500 Lbs. Wheel Diameter 12" Tread Width 3" Tread