Ancor's Marine Grade wire products are the longest lasting and most rugged available. Exceeding UL 1426, ABYC and US Coast Guard Charter boat standards, means they are constructed with premium vinyl insulation that is highly rated . Staying flexible even in extreme cold temperatures, while resisting many corrosive elements. Highest quality, ultra flexible tinned copper stranding provides, maximum protection against electrolysis, fatigue due to vibration and flexing.