Polyurethane Tread on Iron Core Wheel, 3,500 lb Load Rating, 3,000 to 5,999 lb Load Rating Range, 12 in Wheel Dia., 3 in Wheel Width, Polyurethane Wheel/Tread Material, Firm, 92 Shore A, Roller, Standard Tread Shape, 1 1/4 in For Axle Size, Not Included Includes Spanner Bushing, Iron Wheel Core Material, Yes Non-Marking, 3 1/2 in Hub Length