Feature:1. The heat energy is converted into the mechanical kinesthetic energy of the engine, which can be operated by hands to grasp its working principle more intuitively and deepen the interest in physics.2. Simple to assemble, valuable for collection, can be used as school experiment supplies.3. Widely used, for children's science projects, physics/mechanical learning, teacher demonstration props in the classroom.4. Scientific designs of the overall structure to assure system integrity and stability.5. Made of hiqh quality material, safe and eco‑friendly, firm and durable.Specification:Condition: 100% Brand NewItem Type: Stirling Engine ModelMaterial: IronFunction: The heat energy is converted into the mechanical kinesthetic energy of the engine, which can be operated by hands to grasp its working principle more intuitively..Package List:1 x Engine Model1 x Cotton Cloth1 x Blue Cover1 x Jar