[HIGH QUALITY ]: High quality materials, combined with exquisite durability. Ultra high hardness Metal with high- 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! [PERFECT IN WORKMANSHIP]: This engine is also a 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. 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. [GREAT GIFT FOR EVERYONE]: With texture and aesthetic appearance, it's simply a piece of art. Our customers are satisfied with strongly stable structure and exquisite body. [VIVID ]: Displaying basic principle of external combustion engines. Can be used as a teaching tool to demonstrate mechanical or knowledge. Specification: Item Type: Engine Material: Aluminum Color: As shown Product Size: Approx. 150 x 70 x 88 mm Weight: Approx. 451g / 15.9oz Application: It's a 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 Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.