Gosear Colorful Ferris Wheel Revolving Balance Balls Perpetual Motion Crafts Office Desk Home Decor Educational Toy Can use it to waste time, relieve stress, tune out boring coworkers, or schooling youngsters in physics. Popular as an executive desktop game. Brightly colorful metallic balls that rotate like a ferris wheel. Stylish and innovative design, very funny and interesting, can also be a great decoration. After installing 4pcs AA batteries, move lightly, it would keep going on rocking around.