Balance Ball Art in Motion Desk Toy for Kids and Office Decoration

Excellent educational science gadget. Not only demonstrates a pendulum, but also shows the laws of conservation of momentum and energy.
Science toy. When feeling tired of studying and working, you can stir balls to hear the clinking sound to ease.
Excellent educational & science gadget, own your very own piece of scientific history and explore significant values of physics.
Pull back one or more of the balance balls, release them and the same number of balls will swing up on the opposite side.
Great for home ornament, study or office desk table decor accessories, etc. Also good for birthday gift and kids toy.