12 Gauge brown primary automotive wire on a 1,000 Ft. Spool. Brown PVC insulation is ROHS compliant and is temperature rated to 176°F (80°C). For automotive wiring and other general purpose electrical use. Meets SAE J1128. Voltage rating up to 60 volts. Copper core is made from 19 strands of 25 awg pure copper. Made in the USA.