This Stirling engine model can clearly explain the prince of aerodynamics. Intuitive Explanation Teaching will be more intuitive and more interesting. Easy to Understand Student can understand it quicker and better. Easy to Install The assembly process is quick and easily. Specifications: Model: LL-002 Material: Galvanized Iron Sheet & Glass Speed: Up to 200rpm Engine Size: 16.2 * 8.8 * 8.3cm / 6.4 * 3.5 * 3.3" Engine Weight: 308g / 10.8oz Package Size: 17.5 * 9.2 * 11cm / 6.9 * 3.6 * 4.3" Package Weight: 464g / 16.4oz Package List: 1 * Stirling Engine Self-assembly Kit 1 * Lamp (Without liquid) 2 * Spare Tube 1 * User Manual(English/Chinese) Note: 1. Glass should not be exposed to water after being heated, or otherwise it will split. 2. If the is s, please use wet cloth to put out the fire. 3. Children under 12-year-old should be accompanied by adult when using this product.