<b>It is mainly constructed by metal so it is heavy thereby can work stably on table.</b> <br><br> It’s an amazing conversation pieces on your desk, decorative and impressive. It's funny to see people's looks and reactions when they squeeze a little shot for this Stirling engine. <br> Light the alcohol burner, let it warm the glass cylinder for 20 seconds, and then give the wheel a gently push, it will run like a charm. All of your guests want to know what happened, ice-breaking success. What a marvelous toy! <br> it's proven to be a conversation starter to impress your visitors. It’s a cool piece of art even just stands on your desk. <br><br> <b>To be admired and to be talked more from your friends if you have this magic stuff. </b> <br>This stirling engine designed reasonable and compact. You can bring it home, school office with convenient in your bag. <br><br> <b>Features: </b> <br> MODEL: SC02M<br> Status: Assembled<br> Speed: 1700-2000 RPM (revolutions per minute)<br> Material: stainless steel, brass, bearing steel, aluminum, quartz glass<br> Overall size: 165x95x120mm/6.50x3.74x4.72in(L/W/H)<br> Size of flywheel: 60x9mm/2.36x0.28in(Diameter/Thickness)<br> Net Weight: 810g/1.79lb<br><br> <b>Packing List: </b> <br> *Engine x1<br> *Lamp x1<br> *LED x1<br> *Spare tube x1<br><br> <b>100% SATISFACTION GUARANTEE:</b> <br> We're so confident that you'll agree our model is the best that we're offering a 30-Day DARE TO COMPARE Money Back Challenge! <br> Be sure you receive an authentic Sunnytech with our logo to ensure 1-year 100% Satisfaction Guarantee.<br><br> <b>Note:</b> <br> 1.Do not touch the baked test tube and the metal connected to it, so as not to burn.<br> 2.Suitable for more than 8 years of age, 8 years of age need to operate under the guardianship of parents.<br><br> Stirling engine is traditionally classified as an external combustion engine. Please refer to wikipedia for more information.