[ ]: materials, combined with exquisite durability. Ultra high hardness Metal with high-precision size enables those parts to be wear- and interact with each other smoothly. It's designed to, and we do hope and believe it , accompany you for years! [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. [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 be a great ornament on your desk. [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. [VIVID MODEL]: Displaying basic principle of external combustion engines. Can be used as a teaching tool to demonstrate mechanical or physical knowledge. Specification: Item Type: Engine Model Material: Aluminum Color: Product Size: . 150 x 70 x 88 mm Weight: . 451g / 15.9oz Application: It's a well designed and crafted mechanical toy, great to display basic principle of external combustion engines, 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 of the demonstration.3. The ethanol bottle does not contain liquid. Package Contents: 1 x Engine Model