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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. 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! 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. To be admired and to be talked more from your friends if you have this magic stuff. This stirling engine designed reasonable and compact. You can bring it home, school office with convenient in your bag. Features: Speed:1300 to 1500 RPM Dimensions:155*80*130mm /6.10* 3.15* 5.12 in Fly wheel diameter:60mm /2.36 in Driving wheel diameter:25mm / 0.98 in Material: Steel,copper and Aluminium Weight: 500g/ 1.10 lb Color: silver (not black) Packing List: A Stirling Engine ModelAlcohol Lamp A Standby Test Tube A Conveyor Belt A LED 100% SATISFACTION GUARANTEE: 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! Be sure you receive an authentic Sunnytech with our logo to ensure 1-year 100% Satisfaction Guarantee. Note: 1.Do not touch the baked test tube and the metal connected to it, so as not to burn. 2.Suitable for more than 8 years of age, 8 years of age need to operate under the guardianship of parents. Stirling engine is traditionally classified as an external combustion engine. Please refer to wikipedia for more information.