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【Extremely Well Made】Our Stirling engine is crafted from high-quality materials and boasts an elegant design. The base features mirror-surface stainless steel, a glass cylinder liner, and a zinc alloy flywheel. All parts undergo surface treatment to prevent rust, making it a reliable, oil-free model. 【Easy Start】You can easily start this Stirling engine just by placing it on a mug of hot water and giving it a spin. This self-sustaining process continues as long as sufficient temperature differential is maintained, creating a fascinating conversation piece on your desk. 【Wide Applications】The Stirling engine is ideal for various purposes such as kid's science projects, physics or mechanics learning, and classroom demonstrations. It offers a well-designed and crafted mechanical toy to display the basic principles of external combustion engines. 【Perfect Gift Option】Our Stirling engine is an amazing product at an excellent price point. Its elegant design and broad application range make it an ideal gift for kids' science projects, teaching aids for physics/mechanics, and a birthday gift for friends, family, parents, and children. 【Quality Assurance】We promise a 100% satisfaction guarantee for all our customers. If you have any questions about our products, feel free to contact us. We aim to provide a professional and detailed response within 24 hours.