Stainless steel ball and frame with nylon threadIdeal for physical gadgets, stress eliminators, great gift ideas, stress eliminators, desk decorations, Newton ballsNewton's CradleA device that uses multiple swinging balls to demonstrate pulse and energy conservation. When a ball is lifted and released at the end, it will hit the stationary ball and transmit a force through the stationary ball, pushing the last ball upwards. The last ball swings back and hits the almost stationary ball, so the effect repeats in the opposite direction. The device is based on Sir Isaac Newton, a 17th-century British scientist. It is also called Newton Ball or Executive Ball Clicker. Notes:1. If damaged or lost during transportation, it will be sent again for free, please contact us first2. If you receive items, please take out the balls one by one, otherwise the balls will be mixed up at the top. Recommended horizontal setting. 3. The packaging is disassembled and transported and needs to be installed by yourself. The installation time may deviate slightly from the specifications, please wait patiently. 4. Use under adult supervision. Do not put the small parts of the toy in your mouth to prevent the baby from swallowing. 5. The user/buyer will not pay any service fees if the accidental purchase, breakdown or unauthorized disassembly has not caused any damage or other problems due to personal reasons. Used toHigh-quality Newton's cradle 5 office balls, science experiment classroom, science fair decoration, very suitable for birthdays, holidays, parties, weddings, etc. FeaturesDemonstrate a good argument for maintaining the intelligent development of mechanical energy: Newton's law of motion and the starting point of physics (Newtonian motion set). For every action, there is an equal and opposite reaction. Enlighten us to better understand the concept of impulse retention. Content:1 x Newton CradleDimensions: L: 7.1 x 4.7 x 7.1 inches Weight: 2.5 pounds (including packaging)