This product can be described as a multi-functional teaching aid that combines aesthetic and scientific education, particularly suitable for demonstrating and teaching the principles of conservation of angular momentum. Self-balancing Triangle Model: Using the triangle design, this shape allows objects to maintain a seemingly "self-balancing" state while rolling. The triangle is a curve of constant width, meaning that no matter how it rotates, its width is the same at any position. This property allows objects based on it to exhibit interesting movement behavior under certain conditions. Luminous function: The decoration has built-in luminous elements, which can emit soft light in the dark environment, not only increasing the visual appeal, but also helping the observer to track the movement of the model more clearly during the demonstration, especially when the slow or complex movement is demonstrated. Conservation of angular momentum demonstration: By operating this teaching aid, you can vividly and intuitively show the law of conservation of angular momentum to students. That is, when a system is not subjected to external torque, its total angular momentum remains unchanged. With this teaching aid, students can observe how, when changing the speed or direction of one part of the model, other parts adjust accordingly to keep the overall angular momentum constant. Dual use of education and decoration: In addition to being used as a scientific experiment teaching aid, due to its beautiful design and luminous effect, it can also be used as an office, classroom or home decoration, adding a sense of science and technology and modern sense. Color:White Material:Plastic+Metal Package Contents: 1 * Model Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.