Smooth inflatable tires with positive seal air valves. Features two piece bolt together hubs and hub caps. Wheels can be inflated (or deflated) thru a tiny valve in the side of the tire. Axle diameter size 5/32 (4 mm). Ideal as "tundra" tires to give an authentic look. Diameter: 4.50" (114 mm) Axle: 5/32" (4 mm) Weight: 153 grams/wheel Width: 1.650" (42 mm) Made in USA