Newton"s Cradle Balance Ball Desk Toy
Item: Pendulum Balls For Desk
Not only demonstrates a pendulum, but also shows the laws of conservation of momentum and energy.
Includes steel balls, plastic frames, and base.
Often used as a toy.
Easy to install and uninstall.
High-class material and has a very good appearance.
Material: Metal, ABS
1 x pendulum ball
For such value quality is normal. But it will fade very quickly. In more expensive models should be batteries, which together with a magnet create a magnetic field that allows you to knock balls for half an hour or more. There's nothing here. The balls themselves are a little magnetic. Will fade seconds after 20-25