【Premium Acrylic Base】 Equipped with a concave, transparent acrylic tray, the copper egg spins smoothly and visibly—ideal for classroom demonstrations and hands-on learning. 【Magnetic Field Demonstration】 The Egg rotates and stands upright under a rotating magnetic field, clearly showcasing the interaction between induced currents and motion. 【Robust Construction】 Built with precision winding, metal bolts, and a reinforced frame and base. Durable enough for repeated educational use and lab handling. 【Switchable Rotation Direction】 Supports forward and reverse motor control, allowing users to observe how alternating current creates a rotating magnetic field. 【Educational Physics Model】 Perfect for explaining the principles of rotating magnetic fields and asynchronous motors. A valuable tool for science educators, students, and enthusiasts.