Kanthal A-1 is a ferritic iron-chromium-aluminium alloy (FeCrAl alloy) for use at temperatures up to 1400°C (2550°F). The alloy is characterized by high resistivity and very good oxidation resistance.
kanthal wire are electrical heating elements used in high temperature furnaces for heat treatment in ceramics, glass, steel and electronics industries.

The lower the Gauge, the thicker the wire. example 24G is thicker than 28G.