Dynamic Balance and Energy Conservation: You don't have to worry about it falling off, it can keep balance well. Push the ball lightly and it will rotate 360around the center bracket. It doesn't need any battery, you can rotate it or swing it back and forth. Help You Relax: Its a neat focal point to destress after a busy day at work. When you get bored and feel there is too much pressure, you can put it on your desktop, start it, quietly watching its fascinating swings, it will be fascinating to you. It can kill time and help you relieve stress Entertainment Education: This classic desktop game provides you many benefits and entertainments, is suitable for various locations such as house or office, and is an intriguing device that not only demonstrates pendulum motion, but also helps to show the laws of conservation of momentum and energy. Best Gift: Character designed with cute,simple and style. Balanced Weightlifter: You can rotate it or swing it back and forth, slow down the speed when time passed and finally stop. You don't have to worry about it falling off, It can be well keeping balance.