8" x 2" Mold-On Rubber Cast Wheel Swivel Caster - 600 lbs. capacity8" x 2" Mold On Rubber Cast Wheel Swivel Caster 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 Capacity: 600 Lbs. Color: Black Durometer: Shore A 80 (+ 5) Temperature Range: 40 F to 180 F Load Capacity 600