1Multi Color LED: The stirling engine motor model generates electricity due to the heat of high grade alcohol to drive multi color LED illumination 2Aluminium Alloy: The baseplate of the stirling engine model is made of brushed aluminium alloy, the shell frame is CNC finished with sandblasting and an aluminium alloy flywheel 3Reliable Material: The connecting rods of the stirling engine model are cut from stainless steel. The heating cylinder is made of thickened glass for long term heating 4Simple to Operate: The stirling engine motor toy recommends 95% alcohol, let the light burn on the cylinder at the rounded end for about 60 to 120 seconds, then gently push the wheel 5Scope of Application: Suitable as the science project gifts for children, physics and mechanical learning, teacher demonstration props, etc