Polyurethane Tread on Aluminum Core Wheel 770 lb Load Rating 300 to 999 lb Load Rating Range 4 7/8 in Wheel Dia 1 5/8 in Wheel Width Polyurethane Wheel/Tread Material Soft 75 Shore A Precision Ball Standard Tread Shape 1/2 in For Axle Size Not Included Includes Spanner Bushing Aluminum Wheel Core Material Yes Non-Marking 3 17/32 in Hub Length