Feature: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 60120 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 ModelMaterial: Zinc Alloy, Stainless Steel, Glass, LogColor: Mirror, GoldProduct 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 Engine2 x Alcohol Bottle2 x Alcohol Cover2 x Rope1 x English User Manual1 x Alcohol Dropper (3ml)2 x Spare Heated Glass Tubes2 x Lamp Beads1 x LED Filament String