Flat-Free Polyurethane Foam Wheel, 350 lb Load Rating, Ribbed Tread, 13 5/16 in Wheel Dia., 2 in Wheel Width, For Axle Size 5/8 in, 3.50/2.50-8, Standard Tire Rim Type, Center Mount Hub Position, 3 in Hub Length, Steel Hub Material, Yes Non-Marking