Nonmarking Rubber Tread on Plastic Core Wheel 275 lb Load Rating 0 to 299 lb Load Rating Range 4 in Wheel Dia 1 1/2 in Wheel Width Thermoplastic Rubber Wheel/Tread Material Soft 75 Shore A Delrin Standard Tread Shape 3/8 in For Axle Size Not Included Includes Spanner Bushing Plastic Wheel Core Material Yes Non-Marking 1 3/4 in Hub Length