Polyolefin Tread Wheel, 300 lb Load Rating, 300 to 999 lb Load Rating Range, 4 in Wheel Dia., 1 1/4 in Wheel Width, Polyolefin Wheel/Tread Material, Hard, 65 Shore D, Precision Ball, Standard Tread Shape, 3/8 in For Axle Size, Not Included Includes...