Polyurethane Tread on Plastic Core Wheel 650 lb Load Rating 300 to 999 lb Load Rating Range 6 in Wheel Dia 2 in Wheel Width Polyurethane Wheel/Tread Material Firm 98 Shore A Roller Standard Tread Shape 1/2 in For Axle Size Not Included Includes Spanner Bushing Plastic Wheel Core Material Yes Non-Marking 2 3/16 in Hub Length