About this item

• 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.