Polyurethane Tread on Plastic Core Wheel, 450 lb Load Rating, 300 to 999 lb Load Rating Range, 6 in Wheel Dia., 1 1/2 in Wheel Width, Polyurethane Wheel/Tread Material, Firm, 95 Shore A, Delrin, Standard Tread Shape, 3/8 in For Axle Size, Not Included...