Choose a mold, the color you want and accessories to create a unique, customized Hot Wheels car.Frustration free compound! No mess with the simple-to-use Fusion Fluid cartridge.Kid-powered— no batteries or electric components necessary; just click the cartridge in place, push the lever down and watch the magic!Cars are ready in as little as 5 minutes! Set the timer and start preparing the next mold for the assembly line!