18 Ga Black Automotive/General Purpose GXL Wire .94 O.D. 25' Superior Abrasion Resistance, High Heat, Resist grease,Oil, Gasoline,Acids Highest quality GXL wire, Made In America for extreme conditions. Greater than 99 percent pure copper For use in standard automotive, motorcycle, truck/trailer applications. Will stand up in the field to extreme high heat conditions and wet locations, also know as high-temperature automotive wire. A step up from GPT wire, the polyethylene coating of this wire is extra-tough, operating temperature range of -40 To +125 degrees C It's so tough that it's commonly found in automotive applications and engine compartments where vibration and heat can cause wire fatigue. Meets SAE J1128 standards for electrical wiring in surface vehicles