Description: Product Type: This product is an experimental teaching instrument model of a lathe speed changer, suitable for high school physics teaching demonstrations and experiment.Material: The kids educational toy is made from sturdy PP material, ensuring its longevity and resistance to wear and tear.Product Dimensions: With dimensions of 15cmx10cmx7cm, this science toy model is easy to handle and convenient for classroom use.Packaging Details: Each package contains 1 lathe speed changer model for physics teaching, making it easy for you to order the exact quantity you need.Educational Tool: This product serves as an educational tool for high school physics lessons, providing students with a hand approach to learning about lathe speed changers. Specification: Material: PP Size Chart: 15cmx10cmx7cm/5.91inchx3.94inchx2.76inch Package Includes: 1xLathe Transmission Model Note: Please allow slightly errors 1-2cm differences due to manual measurement.