Tinned-copper stranding. Maximum protection against corrosion & electrolysis. Ultra flexible (Type 3) stranding resists fatigue due to vibration & flexing. Premium vinyl insulation resists saltwater, battery acid, oil, gasoline & ultra-violet radiation. Rated at 600 volts & 106C, the heavy-duty insulation is resistant to heat & abrasion. Exceeds all UL 1426, USCG Charter boat (CFR title 46) & ABYC standards.