The Ancor Marine Grade Tinned Copper Primary Wire (12 Gauge) is specially designed for electronic equipment. It has heavy-duty insulation to resist heat and abrasion. It is also made with tinned copper stranding for enhanced protection against corrosion and electrolysis. The Ancor marine grade wire also resists fatigue due to vibration and flexing. This product exceeds all UL 1426 US Coast Guard Charter Boat and ABYC standards.