The must-have vintage object for your desk. Five metal balls hanging from two wires. Pull the first ball away and let it fall back and hit the others... the ball on the opposite side will move with the same momentum as the first! It demonstrates Newton's three laws of motion. The sound of the balls hitting each other stimulates creativity, concentration and relaxation. Newton's Cradle: a hypnotic accessory for your desk! Made in: CN Material: STEEL Height (mm): 90 Weight (mg): 880000 Width (mm): 90 Depth (mm): 75