8" x 2" Polyon Cast Swivel Caster w/ Total Lock Brake - 1250 lbs. Cap.8" x 2" Polyon Cast Wheel Swivel Caster with Total Lock Brake 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 Rig: Zinc plated swivel caster, 4" x 4 1 2" mounting plate, total lock brake Capacity: 1,500 Lbs. Color: Green and Black Durometer: Shore A 95 (+ 5)