Feature:1. Multi Purpose: Stirling engine model kit has a wide range of applications, such as children's science projects, holiday gifts, physical machine learning tools, teacher demonstration props in the classroom, etc.2. Smoother Operation: There are 4 anti skid pads on the bottom of stirling scientific physical model to ensure smoother operation with low noise, low pollution and low running cost.3. Simple to Operate: Stirling scientific physical model is durable, fill the inflamer with 95% alcohol and light it. Let the light burn on the cylinder at the rounded end for about 60 to 120s, push the wheel lightly and it will work.4. Strong Practicability: Stirling engine motor model is a model for physical experiments, glass tubes and glass alcohol lamps are convenient for direct observation of piston movement.5. Practical Gifts: The stirling engine model is a well designed mechanical toy that nicely demonstrates the fundamentals of an external combustion engine and makes a great gift for family and friends.Specification:Item Type: Stirling Engine Motor Model Educational ToyMaterial: Zinc Alloy,Stainless Steel,Glass,LogColor: Mirror,SilverProduct Size:Approx. 160 x 85 x 95mm / 6.3 x 3.3 x 3.7in(Manual Measurement Error is About 1cm)Output Voltage: 3.0-5.0VFuel: 95% Alcohol.Package List:1x Stirling Engine Motor Model Educational Toy1 x Alcohol Bottle1 x Alcohol Cover1 x User Manual1 x Alcohol Dropper (3ml)1 x Spare Heated Glass Tube1 x Lamp Beads1 x RopeNote:Manual measurement error is about 1cm.