4 AWG Battery Cable ANCOR Marine Grade™ wire is manufactured from tinned copper stranding for maximum protection against corrosion and electrolysis. Ultra flexible (Type 3) stranding resists fatigue due to vibration and flexing. ANCOR"s proprietary premium vinyl insulation stays flexible even in extreme cold and resists salt water, battery acid, oil, gasoline and ultraviolet radiation. Exclusive insulation is rated at 600 volts, 105°C dry and 75°C wet, and is resistant to heat and abrasion. Exceeds all UL 1426, US Coast Guard Charterboat (CFR Title 46) and ABYC standards