Celestial Perpetual Motion Balance Ball Office Desk Ornament

Please note this Celestial Perpetual Motion are made from Plastic.
Easy to install.
Magnetic swing - Installed with 4x AA batteries(not included), gently move it and it will always swing up and down.
It's a good tool to relieve stress, spend boring time, or teach student in physic.
It will make you feel how charming the science is.