Pyramid 4-Gauge Clear Black Ground Wire - 25 Ft. 4 AWG Gauge, Economy Oxygen-Free Copper Cable Wire w/ Flexible & Bendable Jacket, Translucent Matte Insulator, Chemical & Heat-Resistant RPB425;

4 Gauge Black Ground Wire 25 ft. OFC 61/0.25 x 7C,D. 9.0mm. Kit is 4 AWG roll of wire. These wires are a copper blend which allows it to be slightly thinner than a standard copper ofc wire, but it's designed to handle the same power limitations as a typical 4 gauge wire.