Polyurethane Tread on Aluminum Core Wheel 600 lb Load Rating 300 to 999 lb Load Rating Range 4 in Wheel Dia 2 in Wheel Width Polyurethane Wheel/Tread Material Firm 98 Shore A Roller Standard Tread Shape 1/2 in 3/4 in For Axle Size Included Includes Spanner Bushing Aluminum Wheel Core Material Yes Non-Marking 2 7/16 in Hub Length