All-Metal Vacuum Stirling Engine DIY Hot Gas Turbine Stem Steam Engine Model Set Physical Experiment Toy Gift LPY [HIGH QUALITY ]: High quality materials, combined with exquisite durability. Ultra high hardness Metal with high-precision size enables those parts to be wear-resistant and interact with each other smoothly. It's designed to, and we do hope and believe it will, accompany you for years!_x000D_ [PERFECT IN WORKMANSHIP]: This engine model is also a well designed and crafted mechanical toy suitable for people of all ages from all works of life._x000D_ [UNIQUE AND GRACEFUL]: The vacuum engine uses the inertia of the flywheel to drive the piston, thereby reducing the pressure in the cylinder. Use an alcohol cotton stick and rotate the flywheel until the machine turns. No water is needed. It will be a great ornament on your desk._x000D_ [GREAT GIFT FOR EVERYONE]: With visual texture and aesthetic appearance, it's simply a piece of art. Our customers are satisfied with its strongly stable structure and exquisite body._x000D_ [VIVID MODEL]: Displaying basic principle of external combustion engines. Can be used as a teaching tool to demonstrate mechanical or physical knowledge._x000D_ _x000D_ Specification: Item Type: Engine Model_x000D_ Material: Aluminum_x000D_ Color: As shown_x000D_ Product Size: Approx. 150 x 70 x 88 mm_x000D_ Weight: Approx. 451g / 15.9oz_x000D_ Application: It's a well designed and crafted mechanical toy, great to display basic principle of external combustion engines,_x000D_ Note:1. During the whole heating process, do not touch the cylinder and heating part with your hands (high temperature danger!).2. Avoid contact with other liquids on the cylinder to prevent the gas from being red and rusty, just turn off the alcohol lamp at the end of the demonstration.3. The ethanol bottle does not contain liquid._x000D_ _x000D_ Package Contents:_x000D_ 1 x Engine Model_x000D_ _x000D_ Only the above package content, other products are not included._x000D_ Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_