Feature: 1. Low Temperature Working Principle: Thermal energy is converted into mechanical energy of the engine, manual operation, more intuitive to master its low temperature working principle. 2. Stainless Steel Base Plate: The base plate is made of brushed stainless steel, strong and durable, not easy to discolor or rust, repeated use is not easy to break, exquisite and beautiful. 3. Wide Range of Applications: Stirling engine is a children's science project, physics, mechanical learning, teacher demonstration props in the classroom. 4. Multi Purpose: Easy to to assemble, collectible, can be used as an ornament, but also as a school experiment supplies. 5. Exquisite Gift: Stirling engine motor model educational toy can be given to children as a holiday gift, they will love this gift. Specification: Item Type: 4 Cylinder Stirling Engine Model Kit Material: Zinc Alloy, Stainless Steel, Glass Fuel: 95% Alcohol (Shipped Without Alcohol). Package List: 1 x Engine Model2 x Alcohol Bottle2 x Alcohol Rope2 x Spare Heating Glass Tube6 x Rubber Gasket1 x Light Bulb3 x Rubber Rings2 x Alcohol Cushion Holder Note: Shipped Without Alcohol