10 Gauge automotive primary wire on a bulk 500ft spool. 19 strands of 23 gauge copper surround. Available in Black, Orange, Red, Blue, Green, Yellow, Brown and White. PVC insulation that's resistant to abrasion, grease, oil, and acids. Rated for up to 60 volts. Temperature rating is 176°F (80°C). RoHS Compliant. Meets SAE J1128. Made in the USA.