Du-Bro 400TL 4" Diameter Treaded Lightweight Wheel The wall thickness is consistent throughout the wheel giving you a balanced tire Comes complete with a sporty nylon metallic hub Du-Bro's low bounce captive air wheels have flown on more airplanes over the years than any other wheels on the market Works well on grass & paved runways These new wheels are lightweight, shock absorbing, fuel resistant and built extremely tuff