1、Stimulate Students' Interest: By operating the Stirling engine, you can more intuitively understand the learning structure and principles. An excellent popular science toy to help develop children's interests. 2、High Quality Material: Stirling engine model is made of high quality materials and fine technology to avoid rust and prolong service life. 3、Easy Operation: After the engine runs smoothly, press the switch to DIY connect the LED diodes. It is a very practical teaching aid for scientific experiments. 4、Excellent Workmanship: The appearance treatment of the machine is exquisite and full of metallic luster. High matching accuracy of parts. It is equipped with a butane gas fuel tank. The machine operates stably and reliably 5、Widely Application: It is widely used in children's science projects, physics and mechanical learning and teachers' classroom demonstration props. 1 x Stirling Engine Model4 x Sticker2 x Gasket2 x Hex Wrench1 x Manual2 x Lamp Tube Item Type: Stirling Engine ModelMaterial: Aluminum Alloy, Stainless Steel, Brass, GlassProduct Size: Approx. 160 x 80 x 95mm / 6.3 x 3.1 x 3.7inWeight: Approx. 623g / 22.0ozGas Used: Butane GasApplication: for Children's Science Projects, Physics And Machine Learning, Classroom Presentations, etc