17mm off-road tire set. 1 set = 4 tires. These will work on Cragar 13mm wheels, 12mm 5 star wheels & other models to upgrade them to work as an off-road setup. For 1/64 scale cars. Maybe more difficult to install on other 13mm models. Experience required. Axle modifications will be required in many cases. Install carefully not to damage wheel. Use lubrication to help install carefully.