Cast Alnico is manufactured by pouring a molten metal alloy into a mold and then further processing it through various heat-treat cycles. The resulting magnet has a dark gray exterior appearance, and may have a rough surface. Machined surfaces have a shiny appearance similar to steel. It permits high temperature operation. It has been used in a wide application in the following fields: Electron, Machinery, Communication, Transportation, Energy & Medical Device, Office Automation, and Auto Mobile Industry. It is also widely applied in high stability fields as aviation, spaceflight, and military technology.