Bullet Points: [ Superior Frame Materials ] With a steel frame and balls that are not easy to break, this Newton's Cradle Balance Pendulum will last for a long time. The high-quality nylon wire is finely processed to ensure smooth swinging and balance. Enjoy the relaxing and fascinating motion of this classic toy [ Fun Education ] This Newton's Cradle Balance Pendulum is a brilliant way to explore the conservation of kinetic energy. When you swing the balls, you can witness how these physics principles work in a stunning and enjoyable way [ Playful Toys ] This Newton's Cradle Balance Pendulum is more than just a pretty ornament. It is also a powerful physics teaching aid that can help children learn scientific knowledge. It is a motion desk toy that can attract children's attention and interest with its amazing movement and design [ Decorative Table Toppers ] This Newton's Cradle Balance Pendulum is a unique and elegant desk decoration that features 7 balance balls. Because of its design, it can impress your guests, friends and children with its fascinating demonstration of physics and motion [ Good Present to Friends ] This Newton's Cradle Balance Pendulum is made of high-quality materials and exquisite craftsmanship. It is a durable and elegant desktop ornament that will add charm and sophistication to your home. It is also a wonderful housewarming gift for your friends and family who appreciate art and science Enjoy the mesmerizing sight of these rustproof balance balls as they swing back and forth in perfect harmony. This motion desk toy demonstrates the principles of conservation of energy in a simple and elegant way. It's also a great desk decoration that adds a touch of sophistication to your home. and experience the charm of Newtons Cradle Product material: stainless steel Product size: 18*9*13cm/7.09*3.54*5.12in After opening the foam, pay attention to take out each ball out of the foam hole in order from the outside to the inside, and pay special attention not to pull the thread hard to avoid the thread being entangled. List: 1* Newton's Cradle Balance Pendulum