This desktop display model is a version of Newton’s cradle, a device that demonstrates conservation of momentum and energy via a series of identically sized swinging spheres. When one ball on the end is lifted and released, the resulting force travels through and pushes the last ball upward. Feature - Color: As shown. - Material: ABS Plastic. - Size: 12.00X8.80X8.00cm/4.72X3.46X3.14in - This Newton’s Cradle can change the color of the ball itself when it is opened. - You can put it on your office desk or your home desk or on your shelf. It will be cool desk toy. - The executive diversion gets a high tech upgrade with color changing LED glass balls. - Swing one, two or three end balls and the changing colors will keep you entranced for hours with multiple color from blinking to cascading. - A fantastic addition to any desk or office. - It can be an present for friends, family and yourself. Relaxing and stress release with it. Package list: 1