4.10/3.50 - 4", LP Flat Free Hand Truck Tire, 2.25" Offset Hub, 5/8" Ball Bearings, Includes 2 Replacement 3/4" Ball Bearings, Four 3/4" Diameter Spacers & A Replacement Axle Lock Washer, Solid Polyurethane Foam Design To Provide The Bounce & Feel Of A Pneumatic Tire With The Benefit Of No Flats, Use For Hand Trucks, Pressure Washers, Air Compressors, & Many Other Small Tire Applications.