Stirling Engine Model External Combustion Model Toy With LED Light Type_Vacuum Engine after careful plating and surface

after careful plating and surface treatment

The design concept is novel

Material: Brass

Be careful not to get hot during operation

On November 2

Stirling Engine Model External Combustion Model Toy With LED Light Type_Vacuum Engine after careful plating and surfaceFeature: Galvanized aluminum promises durability. High temperature resistance and low temperature resistance. LED lights directly demonstrate the process of converting thermal energy into electrical energy. Instructions: The engine model on the horizontal position by hand toggle the flywheel to see if smooth, if there is a strong sense of raw astringent, check the connection rod is normal, whether the cylinder oil and dust, and if so, please use