These Thunderjets pull - back race cars are perfect for slot car enthusiasts and collectors of all ages. You can race them on your track at home or just let them loose on any flat surface for some quick fun. They're designed to fit Aurora AFX or TOMY Super - G Plus HO slot car chassis. Each car has a pull - back spring - actuated motor, so no batteries or tracks are required. With interchangeable bodies, you can create your own unique race cars. There are 12 different models in total, including original and new designs, making them a great addition to your collection.