Features: *Art: It is a fun way to learn science, perfect for kids to experience mechanical fun in classroom education or play with, improving children's ability to explore scientific mysteries. *Conservation of Energy: It won't last forever due to air resistance and friction. Newton's Law Art Ball can move continuously for 8-15 seconds. Good torque and centroid performances. Not only does it demonstrate pendulum motion, but it helps demonstrate the laws of conservation of momentum and energy. *Unique Ornament: Made of plastic, suitable for table sports decoration. Surprise your friends with this clever toy and enjoy the fun of science. *Stress Reliever: Fit for decompression in adults, it's great to release work fatigue and stress after a busy day at work, perfect for outer space science-themed classes or office decor, a great teaching tool for explaining eternal physics. Perfect for birthday, holidays, Christmas, and Father's Day gifts. *Optional: Yellow ( Plug-in model ), Red ( Plug-in model ), Wine Red ( USB charging model ) Specifications: *Material: Plastic *Color: Yellow (Plug-in model), Red (Plug-in model), Wine Red (USB charging model) *Size: 150 x 100 x 150mm *Weight: 229g, 288g Package Included: 1 x Perpetual Motion Machine Decoration Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. _x000D_