Features 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 Toy Material: Zinc Alloy,Stainless Steel,Glass,Log Color: Mirror,Silver Product Size:Approx. 160 x 85 x 95mm / 6.3 x 3.3 x 3.7in(Manual Measurement Error is About 1cm) Output Voltage: 3.0-5.0V Fuel: 95% Alcohol Package List 1x Stirling Engine Motor Model Educational Toy 1 x Alcohol Bottle 1 x Alcohol Cover 1 x User Manual 1 x Alcohol Dropper (3ml) 1 x Spare Heated Glass Tube 1 x Lamp Beads 1 x Rope