Feature: 1. Stirling Engine: A Stirling engine is a heat engine that operates at different temperature levels by cyclically compressing and expanding air or other gas (working fluid), thereby converting the net thermal energy into mechanical work. 2. Imaginative Tabletop Tech Toy: Stirling engine is a fun and imaginative tabletop tech toy with a double mini generator load design that is even more powerful. 3. Scope of Application: Hot air stirling engine model is suitable for children's science projects, physics or mechanical learning, classroom presentations, etc. 4. Premium Material: Stirling model is made of aluminum alloy, stainless steel, brass, plastic and glass, fine workmanship makes the products durable. 5. Ideal Gift: Stirling engine motor has a wide range of applications and can be used as a birthday gift for friends, family, parents, children, etc. Specification: Item Type: Stirling Engine Product Material: Aluminum Alloy, Stainless Steel, Brass, Plastic, Glass Color: As Pictures Shown Weight: Approx. 520g / 18.3oz Gas Used: Butane Gas Product Size: Approx. 180x90x85mm / 7.1x3.5x3.3in Scope of Application: For Children's Science Projects, Physics or Mechanical Learning, Classroom Presentations, etc.. Package List: 1 x Engine Model1 x Ethanol Bottle1 x Ethanol Lamp1 x Wick3 x Socket Head Wrench1 x Sealing Ring1 x Needle Roller1 x Silicone Tube1 x Magnet1 x Manual1 x Hot Cylinder Glass Tube1 x Piston