Feature: 1. Scope Of Application: Mainly used in children's science projects, physics learning and mechanical learning, classroom demonstrations and other occasion. 2. Stirling Engine Model: It is a well designed and made mechanical toy, very suitable for showing the basic principles of external combustion engines. 3. Function: It is convenient to intuitively understand the working principle of the Stirling engine, and deepen the interest and understanding of physics. 4. Well Manufactured: The Stirling engine is made of high quality materials and elegant craftsmanship, strong and durable, not easy to rust, and long‑term use. 5. Innovative Gift: The model is a great gift for anyone interested in science. It can be used as a teaching tool to demonstrate knowledge of mechanics and physics. Specification: Item Type: Stirling Engine Model Material: Iron Weight: Approx. 316g / 11.1oz Product Size: Approx. 12x6cm / 4.7x2.4in Product Use: It is a meticulously designed and made mechanical toy, very suitable for showing the basic principles of external combustion engines. Package List: 1 x Engine Model1 x Transparent Plastic Ethanol Bottle (Without Liquid)1 x Hex Wrench1 x White Wick1 x Transparent Glass Bottle1 x Manual Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. When starting the model, press the bottom plate with your hand, and then turn the big flywheel to prevent the model from falling down.4. The steam engine model should not touch the boiler and the boiler cover, pressing piece, screws and other parts around the boiler by hand during the rotation process, so as to avoid scalding. When the model is running, observe the exhaust at any time. When there is no steam from the exhaust port, please turn off the ethanol lamp in time to prevent the boiler from burning dry.5. During the running of the model, if the model is not running well, you can take the piston (4) out of the cylinder, wipe it clean with paper or dry cloth, and test again.6. The steam engine is an exquisite model and needs to be stored carefully. The water in the boiler should be pour out clean, dry and stored properly.7. Regular maintenance of the steam model, use a dry cloth to gently wipe the parts.8. There is no liquid in the transparent plastic ethanol bottle.