The Wesco Carefree Wheel is made of Microcellular Polyurethane Foam which bridges the gap between rubber and plastic. It is filled with millions of micro air cells which eliminate the possibility of a flat tire. This wheel boasts superior toughness h igh elasticity and tear strength and resistance to oils and greases. It has excellent adhesion to various materials so it won’t come apart from the wheel hubs. It also has excellent cold and warm temperature flexibility. However it has minimal load capacity with a max load capacity of about 300 pounds. This wheel is available in two options. If you want low maintenance wheels for loads less than three hundred pounds the Carefree Wheel is an outstanding choice. Order a set today