High-Quality Materials: The Kinetic Art Perpetual Motion Machine is made from high-quality iron material, and stainless steel for the wires, which features bright colors and great durability. Perfect Design: The Iron Perpetual Motion Machine has a simple shape but a unique and complicated design, which can keep the ball rolling and amaze your friends, suitable for toy and decorations. Educational Tos: The Perpetual Motion Machine Marble is perfect for kids to enjoy the science physics charm, improving their abilities to explore scientific mysteries, bringing great joy and curiosity to them. Home Decorations: The Rolling Ball Perpetual Marble Machine is a classic desktop accessory, perfect for home and office tabletop decorations, which can add elegance to your home or help you relax. Ideal Gift to Friends: The Swing Perpetual Motion Machine is an ideal gift for your friends, families, and colleagues, which has an interesting and attractive design, suitable for both kids and adults to have fun.