<p><strong>Features:</strong><br/>★ Easy to Operate: Just place it on a cup of hot water, and gently flip the wheel until the wheel can run automatically.<br/>★ Superior Performance: By operating the engine, children would observe and know the operational process and more intuitive understanding of the operating principle of Stirling engine, deepening interest in physics. <br/>★ A Classic Stirling Engine Model: Made of premium metal, and the high intensity PC material is heat-resistant and harmless. Transparent body gives you a clear view on how every parts work.<br/>★ Safe for Children: No need to fire an alcohol lamp, safer for children. Fully assembled, no need to install it yourself. <br/>★ Great Educational Toy: classroom or laboratory experimental teaching aids, the best choice gift for students, teachers, children, friends and colleagues.<br/><br/><strong>Specification:</strong><br/>Model: D3<br/>Material: Metal,PC<br/>Size: 9.9 x 11.4cm(DxH)<br/>Weight: 218g/7.7oz<br/>Package Size: 19 x 10.8 x 13/7.5 x 4.2 x 5.1in<br/>Package Weight: 343g/12.1oz<br/><br/><strong>Specification:</strong><br/>1 x Stirling Engine Model</p><div style="border:0px;margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block;overflow:hidden;width:0px;height:0px;left:-9999px;position:absolute;top:0px"></div><p></p>