Features: 1.Kinetic Art, Electronic Perpetual Motion Very good children's science educational toys, improve children's ability to explore scientific mysteries.Perpetual motion machine for adult stress reliever. I could keep watching it forever. Its a neat focal point to release stress after a busy day of working. 2.Perfect Design Use dynamics to allow the ball to loop over it indefinitely. Amaze your friends and make them scratch their heads with this clever toys. Every one will love it. 3.MULTIPLE PURPOSES Its a classic desk accessory is art-in-motion. This cool desk toy will be a good icebreaker when you lay it in your office desk or your home desk. Use it to waste time, relieve stress, tune out boring coworkers, or schooling youngsters in physics. It will be nice desk toy. Good representation of torque and center of mass. Its not only demonstrates pendulum motion, but also helps to show the laws of conservation of momentum and energy. Specification: Sizeas shown Coloras shown Material: Plastic +Steel