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Be the envy of everyone in the office with these Newton's Cradle Pendulum Balls Classics physics based swinging desk display that demonstrates Newton's third law Features 5 chrome effect swinging balls on nylon lines on a frame; pendulum balls illustate kinetic law Demonstrating the conservation of momentum and energy, this will keep you entertained for hours Simple and easy to use; just let one of the outer balls loose and watch the pendulum swing A timeless and classic mixture of science and art; great gift to educate kids on physics Ideal decoration for desk or office space Save 30% with Newton's Cradle Pendulum Balls for 13.99 pounds