Listing is for one (1) Service Caster Flat Free Semi-Pneumatic Hand Truck Dolly Wheel with a 10″ diameter, 2.75” tread width and a 2.25″ centered hub. Included are ball bearings to fit 1/2″, 5/8”, or 3/4″ axles, eliminating the need to guess correct size. Supports 550 pounds (lbs) per wheel. When searching for a reliable and durable solution to your transport needs, consider Service Caster’s pneumatic & flat free semi-pneumatic wheels. Service Caster’s pneumatic and flat free semi-pneumatic wheels are ideal for low speed hand trucks, dollies, carts and any application that requires a cushioned ride. Units are available with centered hubs- commonly used in casters- and offset hubs- commonly used on hand trucks and dollies. With a zinc plated finish, sawtooth treads and finely crafted ball bearings (1/2”, 5/8” and 3/4” sizes included), Service Caster’s pneumatic and flat free semi-pneumatic wheels provide enhanced noise reduction and consistent roll on any surface, for an overall superior ride under any condition. NOTE: NOT FOR HIGHWAY USE! MANUAL SPEEDS ONLY!