Description: Dimension: Approx.15*11.5*15cm (Lx Wx H) Weight: 308g
Colour: As the picture
Material: Plastic & Nylon Feature: The set of balance balls is particularly suitable for the place such as office, desk table, computer table etc. It is a best & useful gift for children to arouse his/her interest in physics. Not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum & Energy. Friction & damping effects are also observed. Pull up one ball & release, only one ball in the other side moves, pull up two, two balls will react, & so on. When you are sleepless, just move your eyes with the bump of the ball, then you may slowly, slowly falling asleep. Watching the bump of the ball is a special way to pass the dull hours.
Material: Solid steel ball, Nylon plumb line, ABS plastic frames & base. Package Included:1 x Newtons Cradle Balance Balls Desk Toy