Wires come in a variety of sizes and are made from many different materials including copper, nickel and aluminum. The diameter of a wire is specified by standard gauges in several different systems. Standard gauges are specified by numbers that vary from one system to another. Among the gauge systems in common use are the American wire gauge (AWG), Standard wire gauge (SWG), Washburn & Moen, and Stubs Iron or Birmingham.
The properties of a specific wire gauge can be found for a number of different gauge systems.