20 gauge Primary Automotive Wire - Black - 1,000 Ft. Spool. Copper core made up of 10 strands of 30 awg pure copper wire. Temperature rating up to 176°F (80°C). Voltage rating of 60 volts or less. Black PVC insulation is resistant to abrasion, grease, oil, and acid. RoHS compliant and Made in the USA.