4 THHN, THWN-2 Stranded Copper Wire for Use in Conduit -
AC/DC Wire and Supply 5' EA THHN THWN MTW 4 AWG Gauge - Black - White - Red - Green - Ground Hook Up Copper Stranded Building Hook Up Wire: Amazon.com: Tools & Home Improvement
Cerrowire 500 ft. 4 Gauge Black Stranded Copper THHN Wire 112-4401J - The Home Depot