Features:
 
.Quality: The bottom is made of aluminum alloy, the others are made of injection molding, strong and durable, without defects
.Product Parameter: The bottom diameter is 10cm, the height is 11.3cm, and the speed is about 600 revolutions per minute
.How to operate: Place the engine on a cup filled with hot water (10cm or less in diameter is enough to keep stirling from falling), preheat it for a minute and then power the flywheel by hand to turn the engine
.How it works: The gas expands when heated and contracts when cooled. The expansion and contraction of the gas as the power to make the piston movement, repeated such a cycle;
.Note: Do not roast or soak in hot water.
.For Age: Over 8 years old