1、A ball at one end hits the other, sending a ball at the other end into the air, while the ball in the middle stays still. 2、Through Newton's pendulum ball, it will greatly stimulate us to better learn and understand Newton's laws of motion. 3、Suitable for adults and children, very suitable for learning science, killing boring time and releasing stress. 4、A great gift, you can send this pendulum to your friends or family members who love science. 5、Beautiful decorations, simple and stylish, this pendulum stand is good for office or study. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin