Description: Product Type: This is a physics experiment equipment, specifically a J22205 mechanical and thermal energy conversion demonstrator, ideal for educational purposesMaterial: The demonstrator is made of iron and copper materials, ensuring its practicalty and longevityProduct Size: The equipment has a compact size with a length of 17cm, making it easy to handle during experimentsPackaging Details: The physical instrument comes in complete set, providing all the necessary components for an effective demonstration of energy conversionEducational Tool: This teaching instrument is great for physics demonstrations in classrooms or laboratories, aiding in the understanding of mechanical and thermal energy interconversion concepts Specification: Material: Iron,Copper Size Chart: Length: 17cm or 6.69inch Package Includes: 1 SetPhysics Experiment Equipment Note: Please allow slightly errors 1-2cm differences due to manual measurement.