Features 1、WORKING PRINCIPLE Stirling engine operates at different temperature levels by cyclically compressing and expanding air or other gases (working fluids), converting thermal energy into mechanical energy. 2、WELL DESIGNED This Stirling engine is a well designed and made mechanical toy, and it is also an excellent gift for friends, family, children or yourself. 3、EDUCATIONAL TOY A great educational toy, classroom or laboratory experiment teaching aids, is conducive to cultivating children's interest in physics. 4、WIDE APPLICATIONS Very suitable for showing the basic principles of external combustion engines, widely used in children's science projects, physics and machinery learning, etc. 5、FINE CRAFTSMANSHIP Select high quality aluminum alloy + composite wood materials, manufactured with fine craftsmanship to avoid rust and prolong service life. Specifications Item Type: Stirling Engine Car Material: Aluminum Alloy + Composite Wood Weight: Approx. 545g / 19.2oz Product Size: Approx. 11x18cm / 4.3x7.1in Application Range: Used for children's science projects, physics mechanical learning, classroom presentations, etc. Package List 1 x Stirling Engine Model 1 x Ethanol Bottle (Without Liquid) 1 x Wick 4 x Wheel 3 x Hex Wrench 1 x Cylinder 1 x Piston 1 x Sealing Ring 1 x Roller Needle 1 x Silicone Tube 1 x Chinese and English Manual