Description: 【Engaging Educational Demonstration】: Good for classroom settings, this tool demonstrates scientific principles in action, capturing students' attention and making learning both fun and engaging 【Simple to Operate】: Perform this incredible illusion effortlessly by simply passing the weight through the aluminum tube. Clear visibility of the weight makes it an impressive yet easy-to-understand trick that anyone can master with included printed instructions for easy setup and performance 【Metal Construction】: Crafted from metal, this demonstrator ensures durability and longevity, allowing for repeated use in classroom settings without compromising on performance 【Educational Tool for Lenz's Law】: Specifically designed to aid in the teaching of Lenz's Law, this equipment provides a hands-on learning experience that enhances students' understanding of electromagnetic principles 【Multifunction】: The electromagnetic induction coil not only teaches the principles of physics but also stimulates curiosity and interest in scientific exploration. It helps students visualize complex physics concepts, making learning interactive and engaging Specification: Material: Metal Size Chart: Hole Diameter: 1.8cm/0.71inch Package Includes: 1x Educational Tool for Lenz Law Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.