Product name:Stirling Engine Model Product size about :As shown in the figure Product color: As shown in the figure Product material:metal Unique Balanced Design This Stirling engine stands out with its innovative balance-style structure, setting it apart from traditional models. Powered by high-grade alcohol, it generates electricity as it operates, lighting up the included LED. A truly fascinating and imaginative educational tool for all ages.  Premium Zinc Alloy Construction Crafted from strong zinc alloy with an electroplated finish, this engine boasts a refined sheen and an industrial aesthetic. High-precision components ensure smooth operation, reliability, and long-lasting performance.  Thoughtful Gift with Elegant Packaging Presented in an elegant gift box, this model is perfect for a variety of occasions, including science projects, physics or mechanical lessons, classroom demonstrations, and birthdays. A memorable gift for students, educators, friends, and family alike.  -AFTER-SALES SUPPORT: If you have any questions or concerns about our products, please feel free to contact us. We will be happy to serve you and ensure your satisfaction. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Package Included: 1 pcs Stirling Engine Model