Manufactured with Ancor's premium UL1426 tin copper battery cable. Flame retardant, UV inhibited, rated to 600V and 105 degrees C. Lugs are tin copper to avoid corrosion and last longer. Each end has a piece of Ancor's adhesive lined 3:1 heatshrink tubing placed over the electrical connection. The heatshrink tubing seals out moisture and other corrosive elements found in the marine environment. Gauge 4 Color Black Length 32" Stud 5/16"