Our MaxxHaul 12" Flat Free Tire is made from high quality, solid polyurethane to prevent any sort of damage, puncture, or deflation to the tire. It has a load capacity of 330 lbs (150 kgs) and is the perfect replacement wheel for trailer dollies, hand trucks, carts, and more. Our tire has a diameter of 12", fits 1 inch diameter axles and has an Hub length of 3-3/4 in. It also comes pre-mounted on a heavy-duty, steel rim for easy installation. This wheel is not meant for highway use.