<ul><li>Newton's Cradle makes a great desktop gift.</li><li>These swinging balls will keep you occupied for hours at work.</li><li>Newton's Cradle is a clever device that not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy.</li><li>Base of the product is made of plastic.</li><li>.</li></ul><br><br>Swingin' Desk Toy Newtonian demonstrator for science teachers. Mindless play for the rest of us. This is a shiny, nicely balanced, high-performance example of the classic Newton's Cradle - a ball on one end of a row of (5) suspended, barely touching balls swings into the others, and the ball at the opposite end reacts to the collision. The 7/8" dia balls in the large version (metal frame 5-1/4" high x 4" x 6", with a wooden base) will collide about 100 times. Awesome. Even more awesome that we paid someone to count the bounces just for you! (Unpacking note: Less awesome if you just yank it out by the suspension lines and pull a couple of balls loose. Be gentle.)

OTC Newton\'s Cradle 7.25\" Desk Top Pendulum Toy with 5 Metal Balls