LED Light Up Newton Cradle Balance Balls Newton Swing Glass Ball Science Psychology Puzzle Desk Fun Toy for Office Home Decoration

Product parameters: Material: glass + fishing line + plastic base Battery: 4 x AA batteries (not included) Size: approx. 12 x 9 x 12 cm / 4.72 x 3.54 x 4.72 inch Package Weight: Approx. 183 g Package Contents: 1 x Balance Balls Toy (batteries not included) Product Description:< br/>This device demonstrates the conservation of momentum and energy through a series of vibrating balls. When one is lifted at the end and released the resultant force moves through the line and pushes the last one up; or presses a side swing all balls in a line. Swing one two or three end balls and the changing colors will keep you hooked for hours with multiple color change modes (flashing to cascading). You can put it on your desk or on your desk or on your shelf. It will be cool desk toy. Note! This product does not contain batteries. You need to prepare 4 AA batteries by yourself