Kunhua 16-PU-Y-ZW-20 4.80/4.00-8"-inch Flat Free Wheelbarrow Tire with Ribbed Tread - 6"-inch Centered Hub(Two Sides Symmetrical) - 3/4"-inch Ball Bearings - 15.5"-inch Tire Diameter (Yellow) Flat Free Tire made of solid polyurethane foam. Non-marking. Ribbed Tread. 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. 500 lb load capacity. Not for highway use.