Peanut Shaped Stirling Double Cylinder Low Temperature Difference Engine Model Educational Toy.  Features: -Interesting Structure: Unlike most low temperature Stirlings on the market, this product uses a two-cylinder linkage structure, and the two bases are simultaneously operated by a flywheel in the tropics. When operating, the connecting rod swings up and down like a balance.  -Reliable Quality: aluminum alloy base (after sandblasting and black oxide process), aluminum alloy column, iron flywheel (with nickel plating process), brass power cylinder block, overall texture.  -Simple Operation: Place the base on the cup with hot water. After preheating for more than 10 seconds, use the flywheel to assist the engine and the engine will run by itself.  -Theory: The focus of the low temperature Stirling engine operation is the temperature difference, which is the conversion of thermal energy into mechanical power energy. Use high temperature water during operation, which will result in a larger temperature difference for better engine operation. Also, don't touch the water on the base.   -Use Value: Through the hands-on operation, you can observe the entire engine running process, more intuitive understanding of the operating principle of the low temperature Stirling engine, and deepen the interest in physics learning.  -The product design is exquisite: the workmanship is excellent, not only can you get started, but also can be used as a beautiful decoration. -Suitable for people over eight years old.    Description: Item Name: Low Temperature Stirling Engine;  Weight: 600g;  Color: As Shown;  Shape: Peanut Shaped;  Material: Aluminium Alloy + Brass;  Size: 17.5 x 9.1 x 15.65 cm;  Package Size: 22 x 18 x 10cm;  Packing: Box;    Package Included: 1 x Low Temperature Stirling Engine