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 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 Toy1 x Alcohol Bottle1 x Alcohol Cover1 x User Manual1 x Alcohol Dropper (3ml)1 x Spare Heated Glass Tube1 x Lamp Beads1 x Rope Note: Manual measurement error is about 1cm.