Auto World Xtraction Ultra-G Release 7, Complete 12 car set Each HO scale slot car comes complete snap-on body that is attached to a brand new Xtraction Ultra-G chassis with track gripping rubber tires. Each HO scale X-Traction slot car is made to run on any electric HO scale race track including Aurora, Model Motoring, Tomy, Mattel, Lifelike, Tyco and Auto World's...of course. Hobby Talk members Discount available....