RWM Casters UPR-0820-08 8" Diameter X 2" Width Urethane On Polypropylene Wheels With Straight Roller Bearing, 1000 lbs Capacity 1/2" Axle diameter, 2-7/16" hub length, 1000lbs capacity^Urethane on polypropylene wheels with straight roller bearing^95 Shore A durometer hardness^Temperature range from -40 degree F to 175 degree F