Features: 100% brand new and high quality [Material] It is made of metal, which is sturdy and durable, and it is not easy to be damaged during the assembly process. [Size] 10x13cm/3.93x5.11inch. By operating the engine, children will observe and understand the operating process of the Stirling engine, understand the working principle of the Stirling engine more intuitively, and deepen their interest in physics. [Easy operation] Pour a cup of hot coffee, put Sterling on the cup, and it works magically. When the temperature drops, the temperature of the coffee is suitable for drinking. Enjoy the physical power transmission device display and coffee. [Innovative design] The Stirling engine model is adopted and the basic principle of an external combustion engine is used to drive the flywheel to rotate. [Wide scope of application] This model kit has a wide range of applications, such as children's science projects, physics/mechanical learning, teachers, classroom demonstration props, friends, family, parents, children's birthday gifts, etc. Package Includes: 1x Low Temperature Stirling Engine Specifications: Material: Metal Weight: 275g Size: 10x13cm/3.93x5.11inch note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.