1. Product name; Newtons Cradle
2. Material: wood + metal
3. Size: 180 * 120 * 180mm
4. Product Description: According to Newton’s principle, five balls side by side the first ball hit the second ball, was knocked out is the fifth ball, and according to the principle of inertia will be maintained for some time, you can hit two balls Two balls, the middle of the ball is not moving