Polyurethane Tread on Plastic Core Wheel 280 lb Load Rating 0 to 299 lb Load Rating Range 5 in Wheel Dia 1 1/4 in Wheel Width Polyurethane Wheel/Tread Material Firm 95 Shore A Delrin Standard Tread Shape 5/16 in For Axle Size Not Included Includes Spanner Bushing Plastic Wheel Core Material Yes Non-Marking 1 1/2 in Hub Length