Polypropylene Tread Wheel 250 lb Load Rating 0 to 299 lb Load Rating Range 3 1/2 in Wheel Dia 1 3/8 in Wheel Width Polyolefin Wheel/Tread Material Hard 70 Shore D Delrin Standard Tread Shape 3/8 in For Axle Size Not Included Includes Spanner Bushing Plastic Wheel Core Material Yes Non-Marking 1 1/2 in Hub Length