Material: The bottom plate is Made of brushed aluminum. Exquisite and beautiful, the flywheel adopts Aluminum fine car. The combination of texture and beauty; the connecting rod is made of stainless steel; The connecting sleeve of the Power cylinder is made of aluminum , and the heating cylinder is made of thick glass made . It has no pressure for long term heating. Stirling :Reversible composed of two constant volume heat absorption processes and two constant volume expansion processes, and constant volume heat release the heat released by the process happens to be absorbed by the constant volume endothermic process Turn the flywheel by hand to see If it is and does not fit the related screws smoothly (adjusted ) Check that the sliding parts Are clean;Fill the alcohol lamp two Thirds; alcohol above 95 degrees is the best. the alcohol lamp and put it in front of the test tube. After about 1 , turn the flywheel and the engine will spin;The new power cylinder has been upgraded to a copper cylinder , which is more texture and beautiful colour: silver Material: Aluminum size: Approximately 23x13x16cm Package Contents: 1 * Stirling Engine PRECAUTIONARY MEASURES: Not the fried test tube To avoid . the alcohol lamp for a long time, and the alcohol lamp cannot be Pressed to avoid . When heating, do not wire the test tube with the alcohol lamp. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.