【 Demonstration Ornament 】A classic tool for demonstrating the conservation of momentum . When you flick one ball , the ball on the other side swings simultaneously , intuitively showing the principles of physics . The metal balls collide crisply , swinging smoothly . It is not only a fun scientific teaching aid but also adds a dynamic aesthetic to your desk 【 Multi Scenario Use 】Suitable as a science enlightenment present for students , or as a desk decoration for colleagues and friends . Its simple appearance fits in study rooms , offices , bedrooms , living rooms , and more , serving both as a stress relief ornament and a desk decoration 【 Metal and Plastic Structure 】Made with a high polish stainless steel frame and shiny metal balls , paired with a plastic base . Exquisite and eye catching , with smooth and simple lines . The metal surface is smooth and resistant to oxidation , and the base is stable and non slip , preventing damage to the desk while maintaining the ornament’s long lasting quality 【 Stable Placement 】The frame uses metal welding craftsmanship , making it sturdy and not easy to loosen . The stainless steel balls are drop resistant and not easily deformed . The plastic base is stable and is not easy to tip over , ensuring the ornament remains undamaged and swings steadily even with daily placement or minor bumps 【 Stress Relief 】When work or study stresses are high , gently flick the balls and watch them swing rhythmically while listening to the crisp collision sounds . This quickly relieves anxiety . Compact and space saving , suitable for office workers , students , or any setting requiring focus , it serves as a small helper for relaxation