Conductor: Bare, soft annealed copper per ASTM B-3.
Size: 12AWG: Solid or bunched, unilay concentric combination unilay or compressed stranded (class C) alternate ASTM B-787, ASTM B-3 or ASTM B-8 and UL-83.
Overall Jacket: Nylon per UL-83 and UL-1063.
Cables conform to the following standards:
UL-83 for THHN-THWN, UL-1063 for MTW (stranded conductors only), Federal Specification A-A-59544, NEMA WC-5, UL-75f8 or AWM Styles 1316 through 1321, 1408 through 1414, 1452 and 1453.