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4 THHN, THWN-2 Stranded Copper Wire for Use in Conduit -
4 Gauge 4 AWG 100 Feet Red + 100 Feet Black (200 Feet Total) Welding Battery Pure Copper Flexible Cable Wire - Car, Inverter, RV, Solar by WindyNation - Amazon.com
WNI 4/0 Gauge 10 Feet Black 10 Feet Red 4/0 AWG Ultra Flexible Welding Battery Copper Cable Wire - Made In The USA - Car, Inverter, RV, Solar - Amazon.com
Southwire SIMpull 500-ft 4-AWG Stranded Black Copper Thhn Wire (By-the-foot) in the TFFN & THHN Wire department at Lowes.com