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These Balance Balls are a timeless, classic, desktop physics display. They are an ideal mix of science and art. Simply lift one steel ball back and let go! The ball at the opposite end of the display will swing out in equal distance! This Balance Ball display sits 7" wide by 5" tall and has five physics metal balls. The colors of the display are black and chrome. The base and arms of the display are made of durable plastic. The Balance Balls are made from metal. The Balance Balls are mesmerizing to watch as they exhibit Newton's third law. Also known as "Balance Balls", "Newton's Pendulum" and "Newton's Balls", this product demonstrates the law of conservation of momentum. The original Newton's Cradle was invented in 1967 by English actor Simon Prebble and named in honor of scientist and mathematician Isaac Newton because it employs Newton's Laws. Test Newton's Laws by pulling back two, three, or four balls at once! This low-cost, affordable, executive office toy is an ideal purchase for yourself or a gift for someone you know.