12mm Newton is Cradle Balance Ball Physics Science Fun Desk Toy (Silver)

1) Brand new and high quality.

2) Not only demonstrates a pendulum but also shows the Laws of Conservation of Momentum and Energy.

3) Friction and damping effects are also observed.

4) Often used as a toy to amuse people.

5) Includes steel balls plastic frames and base.

6) Great gift for everyone.

7) Unfold size:18cm x 11cm x 14cm