Product Description Universal Fit Flat Free Hand Truck Tire is made of solid polyurethane foam. No flat tires have the same bounce, feel, cushion, and performance as pneumatic (air-filled) tires. They are also non-marking and will not be affected by Ozone or UV rays. Airless Tires are made of lightweight, solid polyurethane foam and are to never go flat. Tire is 10. 5" in diameter, comes standard with a 2. 25" offset hub and 5/8" Ball Bearings. Includes adapter kit with additional bushings and spacers to fit your equipment - Adapter kit includes the following items: (1) - 1/4" Spacers, (3) - 1/2" Spacers, (2) - 3/4" Ball Bearings (5/8" installed), (1) - 5/8" Axle Cap From the Manufacturer Universal Fit Flat Free Hand Truck Tire is made of solid polyurethane foam. No flat tires have the same bounce, feel, cushion, and performance as pneumatic (air-filled) tires. They are also non-marking and will not be affected by Ozone or UV rays. Airless Tires are made of lightweight, solid polyurethane foam and are guaranteed to never go flat. Tire is 10.5" in diameter, comes standard with a 2.25" offset hub and 5/8" Ball Bearings. Includes adapter kit with additional bushings and spacers to fit your equipment - Adapter kit includes the following items: (1) - 1/4" Spacers, (3) - 1/2" Spacers, (2) - 3/4" Ball Bearings (5/8" installed), (1) - 5/8" Axle Cap