Tinned Copper Wire, 12 AWG (3mm²), Black - 12ft186003 Ancor Marine Grade wire products are the longest lasting and most rugged available, exceeding UL 1426, ABYC and US Coast Guard Charter boat (CFR Title 46) standards. They are constructed with premium vinyl insulation that is rated at 600 volts, 105 deg C dry and 75 deg C wet, stays flexible even in extreme cold (-40 deg F/C) and resists salt water, battery acid, oil, gasoline, heat, abrasion and ultra-violet radiation. Highest quality ultra flexible (Type 3) tinned copper stranding provides maximum protection against corrosion and electrolysis while resisting fatigue due to vibration and flexing.