This smooth tread, flat free tire is designed for the front caster on zero turn mowers and other equipment, Marathon Flat Free tires provide the bounce and load handling characteristics similar to an airfilled tire with the benefit of never going flat, 9x3, 504 Tire, 9, 3 Tire Diameter, 3, 3 Tire Width, Flat Free Tire made of solid, polyurethane foam, Nonmarking, Smooth Tread, 4 Centered Hub, 34 Precision Ball Bearings, Designed for zeroturn lawnmowers and other equipment, 300 lb load capacity, Not for highway use, SKU: MTNI031