8" x 2" Mold-On Rubber on Cast Swivel Caster, Total Lock Brake, 600 lb. Cap8" x 2" Mold On Rubber on Cast Wheel Swivel Caster with Total Lock Brake The mold on rubber cast wheel is an economic wheel, providing cushion while rolling on a strong cast iron core. This wheel performs best in dry applications. Tread: Rubber, Vulcanized To Core Core: Cast Iron Core Bearing: Roller Bearing Rig: Zinc plated swivel caster, 4" x 4 1 2" mounting plate, total lock brake Capacity: 600 Lbs. Color: Black Durometer: Shore A 80 (+ 5)