Product Name: PU Foam Wheel Model NO.: PF1020 Product Description Flat free tire size: 3.00-4metal rim with ball bearingWe are as a manufacturer of producing many kinds of PU Foam wheels, such as 6"*2", 200*50, 2.50-4, 3.00-4, 4.10/3.50-4, 3.00-8, 4.00-6,4.80/4.00-8, 4.00-10, 4.00-11, 5.00-6, 18*8.50-8The Pu foam tyre is a solid, but lightweight tire constructed from a proprietary formula of Micro-Cellular polyurethane. Designed for light to medium duty applications, the Pu Foam Tyres is guaranteed to be puncture free from flats and does not require any maintenance in the form of air pressure. Some of the most common applications are for Wheelbarrows, Hand Trucks, Lawn Mowers and Garden Tractors.