1. Stimulate Students' Interest: By operating the Stirling engine, you can more intuitively understand the learning structure and principles. An excellent 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 . High matching accuracy of parts. 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. Item Type: Stirling Engine Model Weight: . 623g / 22.0oz Gas Used: Butane Gas (not included) Application: for Children's Science Projects, Physics And Machine Learning, Classroom Presentations, etc. Due to different batches, there may be differences in the appearance, color, and printing of the product, which does not affect its use Colour:As Shown Material:Aluminum alloy, stainless steel, brass Package Contents: 1 x Engine Model Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.