Sell Perpetual Motion Magnetic Swing Pendulum Swing Decoration Desktop Craft best price

OPTION Balance Ball Ferris Wheel Ball Orbital Features: 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. Descriptions: 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.