Play with Hot Wheels in innovative ways that inspire creativity and learning while having a blast! Get started with the Speed Winders Twisted Cycle by using rubber bands to supply the power – crank up the speed as you wind up the rubber bands inside – and take off! Speed Winders work with all kinds of rubber bands. Experiment with rubber band sizes and the number of cranks to vary the play and speed. If you have the Torque Twister (sold separately) you can connect the vehicles front to back to form the epic "Drag-moto" and double the speed. 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.