Kunhua 16-PU-Y-FK-20 4.80/4.00-8" Flat Free Wheelbarrow Tire with Knobby Tread 6" Centered Hub(Two Sides Symmetrical) 3/4" Ball Bearings 15.5" Tire Diameter Flat Free Tire made of solid polyurethane foam,don't have to inflate it Perfect for Contractor Wheelbarrows. Most Common for 6 Cubic Foot Wheelbarrow Providing the bounce and load handling characteristics similar to an air-filled tire with the benefit of never going flat 4.80/4.00-8" Tire. 15.5" Tire Diameter.6" Centered Hub(two sides symmetrical). 3/4" Ball Bearings 520 lbs load capacity. Not for highway use