A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas, the working fluid, at different temperature levels such that there is a net conversion of heat energy to mechanical work,The engine is like a steam engine in that all of the engine's heat flows in and out through the engine wall. How the stirling engine works? This is traditionally known as an external combustion engine in contrast to an internal combustion engine where the heat input is by combustion of a fuel within the body of the working fluid. Unlike the steam engine's use of water in both its liquid and gaseous phases as the fluid, the Stirling engine encloses a fixed quantity of permanently gaseous fluid such as air or helium. As in all heat engines, the general cycle consists of compressing cool gas, heating the gas, expanding the hot gas, and finally cooling the gas before repeating the cycle General Description: Exquisite workmanship, compact design while powerful Ready to run, super free running Magnet inside the fuel burner, it well attaches the metal base plate Materials (base unit): Solid Wood Materials (Crankshaft) : Pure Brass Materials (Bracket) : Stainless Steel in Hollow Design Materials (Fuel Container) : Exquisite workmanship fuel container in Aluminum Alloy made Dimension : 150 X 70 X 90mm Package Contents: The engine will come exactly as the pictures show, all pictures post here are truly captured 1 x Engine Unit 1 x Fuel Burner (pure aluminum alloy made with fine polished finishing) 1x Fuel Filling Tool 3 x Wrench