This JT&T Products Blue 166F 16 AWG Primary Wire is a standard for original machinery and as a replacement on vehicular equipment. It features stranded, annealed single-conductor copper built within general purpose thermoplastic (GPT) insulation, which is suitable for operation between extreme temperatures. This blue electrical wire has a smooth surface that’s ideal for pulling through loom or JT&T Flex-Guard convoluted tubing. It is resistant to grease, oils and acids.