RWM Casters USB-0208-05 2" Diameter X 7/8" Width Urethane Solid Wheel with Ball Bearing, 125 lbs Capacity 5/16" Axle diameter, 1-1/2" hub length, 125lbs capacity^Urethane on polypropylene wheel with ball bearing^95 Durometer shore a hardness^Temperature range from -40 degree F to +175 degree F