This 18 gauge GXL Automotive Primary Wire is a durable type of hook-up wire consisting of stranded copper conductors and a thin-walled, cross-linked polyethylene (XLPE) insulation.
This hook-up wire construction is capable of resisting high temperatures of up to 125°C (257°F); the XLPE coating also protects the wire from abrasion, oils, chemicals, fuels, and solvents, while also remaining flexible enough to fit wherever it might be needed. 18 AWG Gauge GXL Automotive Stranded Hook Up Wire, 500 ft Length, Gray, 0. As such, this hook-up wire is ideal for higher temperature, more rugged circuit wiring applications that specify SAE J1128 requirements (such as automotive, electric motor, and generator applications).