Eliminate downtime with the National Standard Flat Free, Hand Truck / All Purpose Utility Tire and Wheel Assembly. The tire is 10 in diameter and is compatible with many types of utility equipment such as air compressors, pressure washers, generators, blowers, hand trucks (dollies), garden carts, and more. It is made of solid, polyurethane foam that has the same bounce and handling feel as an air-filled tire. It won't leave marks on any surfaces and will not deteriorate when left exposed to sun or moisture. Best of all, it's guaranteed to never go flat. Note: not for highway use.