1) Balancing Ball Newton's Cradles are great for home of the office desk! Newton's Cradleof an odd number of identical steel balls each suspended by a bifilar suspensionfrom a sturdy frame. The balls are aligned along a horizontalline, just touching.2) When the ball on one end is pulled aside and allowed to swing as a pendulum,it hitsthe next ball. The outcome is fascinating, the one ball on the far end is knockedaway from the others with the same speed as the first ball had initially andall of the other balls remain nearly at rest !.

3) If you pull back two balls and let them strike the others, two balls are knocked from the other end, and all the other balls remain nearly at rest.Great for stress relief and makes a wonderful gift!

9x9x11cm

Metal Newton's cradle