Made of high quality material, safe and durable to use.
Not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy.
Friction and damping effects are also observed.
Often used as a toy to amuse people.
Package Included: steel balls, plastic frames and base.
Great gift for everyone.
DIY Eco-friendly,Exquisite Workmanship.
A Top Birthday,Party,Festival,etc.gifts, for friends,kids,lovers.
A nice choice to home office table decoration and teaching model.
When feeling tired of studying and working, you can stir balls to hear the clinking sound to ease;
Applicable to desk and household decoration, birthday gift.