The JT&T Products Purple 164C 16 AWG Primary Wire is built to accommodate extreme temperatures. It has stranded, annealed single-conductor copper that’s housed within general-purpose thermoplastic (GPT) insulation. Use this automotive primary wire for a wide range of professional jobs, as well as do-it-yourself repairs. Its smooth surface makes it ideal for pulling through loom or JT&T Flex-Guard convoluted tubing.