Features 1、Physical Experimental Model: Glass tube and glass alcohol lamp facilitate direct observation of piston movement. 2、Multifunctional: Elegant gift wrap, low noise, low pollution, low running cost. 3、Anti Skid: There are 4 anti skid pads at the bottom of the model machine to ensure steady operation. 4、Simple To Operate And Long Lasting: Fill the alcohol lamp with 95% alcohol (we recommend this fuel) and light it. Let the light burn on the cylinder at the round end for about 60‑120 seconds, then push the wheel lightly and it will work like a charm. 5、Multipurpose: It has a wide range of applications, such as gifts for children's science projects, physical machine learning, teacher demonstration props in the classroom, friends, family, parents, children's birthday gifts, etc. Specification Item Type: Stirling Engine Model Material: Zinc Alloy, Stainless Steel, Glass, Log Color: Mirror, Gold Product Size: Approx.17 x 13 x 9.5cm / 6.7 x 5.1 x 3.7in (There Is An Error Of About 1cm In Manual Measurement) Fuel: 95% Alcohol Package List 1 x Engine 2 x Alcohol Bottle 2 x Alcohol Cover 2 x Rope 1 x English User Manual 1 x Alcohol Dropper (3ml) 2 x Spare Heated Glass Tubes 2 x Lamp Beads 1 x LED Filament String