MarsGeek Classic Newton's Cradle Balance Balls with Metal Ball and Black Wooden Base Physics Teaching Tools Gift Toy Desk Decoration

High quality:The frame is Stainless Steel mounted on a Solid Wooden Base, with 5 Stainless Steel Pendulum Balls hung using High Quality Nylon line. Makes the perfect gift for adults, teenagers, and children over 6 years. The Cradle Balance is perfect as an office or home decoration . It's one of those gifts that lasts for years, and never gets old. It is great as a stress relief gadget in the home or office. It is also great for kids with ADHD or autism. The balance balls continue in perpetual motion for about 20 seconds due to the resistance of the air and friction, but it won't influence the effect of playing although it can not reach the seamless convergence among balls in the vacuum.