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Here are the details of the Newton's Cradle Pendulum Balls. 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