10 Gauge Black Ground Wire 100 ft. OFC 15/0.25 x 7C,D. 5.0mm. 10 Gauge BLACK Power Cable - 100 Foot Spool Length with 5.0mm Cable Diameter. Economy OFC (Oxygen Free Copper) Wire - Finely Stranded OFC Cable. Insulated for Chemical and Heat Resistance Wiring - High Temperature Rating. Translucent "Matte" Insulator Coating - Extremely Flexible & Bendable Jacket. 10 AWG Electrical Grounding - Maintains Safe and Reliable Voltage Levels