Ancor Marine Grade Primary Wire is manufactured from tinned copper stranding for maximum protection against corrosion and electrolysis. Ultra-flexible (Type 3) stranding helps prevent fatigue due to vibration and flexing. Ancor's proprietary premium vinyl insulation stays flexible even in extreme cold (-40° F/ -40° C) and resists salt water, battery acid, oil, gasoline, and ultraviolet radiation. The wire's exclusive insulation is rated at 600 volts, 221° F / 105° C dry and 167° F / 75° C wet, and is engineered to withstand heat and abrasions. Exceeds all UL 1426, US Coast Guard Charter boat (CFR Title 46), and ABYC standards. Vinyl insulation stays flexible in extreme cold Resists salt water, battery acid, oil/gas, UV rays Rated at 600 volts; withstands heat/abrasions | Marine Grade Primary Wire, 16 American Wire Gauge, 25' in White