Each strand of Ancor wire has a tin coating for extra corrosion resistance (note the “silver” look to Ancor wire when you strip it). Vibration is always present on a boat, and will quickly fatigue and crack coarsely-stranded wire. Ancor wire is Type 3 stranded, meaning that it has 5?10 times more copper strands than Type 2 wire, so it’s more flexible and fatigue-resistant. Ancor wire is Marine UL-listed, and meets the highest ABYC standards for AC or DC use. Finally, Ancor wire is based on AWG (American Wire Gauge) wire sizes, which are 6?12% larger than SAE gauge wire, so you get more current-carrying ability than from similar SAE wire.