Description: - The engine adopts mirror surface stainless steel for the base, glass cylinder liner, Precision bearing, bearing steel shafts, zinc alloy flywheel. all the parts have done surface to avoid rusting. oil-free. - : just place on a mug of hot water and give it a and you' and running; as long as enough temperature difference maintains, it will like forrest gump. - Wide applications: people bought it for kids' science project, physics/mechanics learning, demonstration on class, etc. - With elegant design and fine workmanship, this is a beautiful piece of art.Size Chart:Base Diameter: 10cm / 3.93inHeigth: 10cm / 3.93inPackage Includes:1 Piece Low Temperature EngineNote:Please allow 1-3mm measuring deviation due to manual measurement.Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.