Play with Hot Wheels in new, innovative ways that inspire creativity and learning while having a blast! Get started with the 1:64 scale Speed Winders Track Stars Assortment by using rubber bands to supply the power. Crank up the speed as you wind the rubber bands inside the drive shaft using the back knob! Looking for performance? These rubber band-powered cars can perform up to 5 loops with no launcher or booster! Experiment with different bands and adjust the number of times you crank to achieve different speeds and distances. Powering vehicles with rubber bands takes the thrill of Hot Wheels into the realm of Science, Technology, Engineering, Art and Math— the building blocks for problem solving and innovation. Experiment with the rubber bands included or any others that you can get your hands on. Each sold separately. Not for use with some Hot Wheels track sets.