EASY OPERATION: Convenient for hands-on operation, more intuitively grasp its working principle, and deepen your interest in physics. Operating PrinciplesMethods, The stirling engine is powered by the expansion of the gas and the compression of the cold.A WORKING MODEL WITH EXCELLENT TECHNIQUE: Pursue details, the whole is finely polished, the hand feels glossy, very metallic and modern technology. brushed aluminum base with 4 rubber pads ensures its stability while working. The metal bracket and metal piston are firm, which is a perfect combination of texture and beauty.WIDE APPLICATIONS: The model kit has a wide range of applications, gifts for children's science projects, physicsmechanical learning, ect. It's a vivid model displaying basic principle of external combustion engines. People bought it for kids' science project, physics/mechanics learning, etc., enlightening them to explore more scientific knowledge.GREAT GIFT FOR EVERYONE: The product itself has been assembled, has collection value, can be used as decoration, can be directly used in experiments, simple and convenient. It will definitely be a fantastic gift for those you love and SELDOM will our machine fail to cheer them upSATISFACTION GUARANTEED: A YEAR WARRANTY, FREE RETURN AND EXCHANGEWe promises every customer a 100% shopping satisfaction, feel free to reach us if you have any questions about your purchase.We will give you a professional and detailed reply within 24 hours.Click to buy now