Du-Bro Treaded Tire 3" (76mm) Part No: 300T. Du-Bro`s low bounce captive air wheels have flown on more airplanes over the years than any other wheels on the market! The wall thickness is consistent throughout the wheel giving you a balanced tire. Comes complete with a sporty nylon metallic hub. Works well on grass & paved runways. These also have many more applications in school projects and various crafts. Diameter: 3.00" (76.2 mm), Axle Diameter: 5/32" (4 mm), Weight: 458grams/wheel, Width: 1.030" (26 mm)