Hot Wheels Workshop Bungee Motors LP Track Set Start collecting the 1:64 scale Speed Winders Track Stars Assortment. Speed Winders vehicles use rubber bands (included) to supply the power Crank up the speed as you wind the rubber bands inside the drive shaft using the back knob Experiment with different bands and adjust the number of times you crank to achieve different speeds and distances Hot Wheels Speed Winders Track Stars can perform up to 5 loops with no launcher or booster! 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.