Features: Discover the fascinating world of physics with the Iron Ball Electromagnetic Reciprocating Motion Model, demonstrate Lorentz force and magnetic field induction in a captivating way. This model features coil system and high quality copper construction, ensuring durability and precise electromagnetic motion for educational experiments. Ideal for physics enthusiasts, educators, and students, this model serves as excellent tool for hands on exploration of electromagnetic principles. Perfect for classroom demonstrations, science fair, this model provides a practical understanding of complex physics concepts through interactive experimentation. Enhances your teaching toolkit with this electromagnetic model that brings theoretical physics to life, making abstract concepts engaging. Specifications: Component:Copper Size:Approx.430mm/16.93inch Package Includes: 1Pc Reciprocating Motion Model note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.