Shepherd Hardware 9591 6-Inch Semi-Pneumatic Rubber Tire, Steel Hub with Ball Bearings, Diamond Tread, 1/2-Inch Bore Centered Axle 3-3/4-inch diameter steel rim with 1-5\8-inch centered hub, ball bearings and 1/2-inch bore 1-1/2-inch wide X 6-inch diameter semi-pneumatic tire with diamond tread 88-lb load capacity These tires are ideal for hand trucks, lawnmowers, utility carts, and other lawn and garden equipment Semi-pneumatic tires are light weight, puncture proof, and provide cushioning. They are designed to not pull away from their rim under use.