RWM Casters POB-0312-06 3" Diameter X 1-1/4" Width Polyolefin Wheel With Ball Bearing, 250 lbs Capacity 3/8" Axle diameter, 1-1/2" hub length, 250lbs capacity^Polyolefin wheel with ball bearing^65 to 70 Shore D durometer hardness^Temperature range from -20 degree F to 230 degree F