4 AWG Gauge Red + Black Pure Copper Battery Inverter Cables Solar, RV, Car, Boat 3 feet 3/8 in Lugs Manufactured with ultra-flexible WindyNation Power-Flex Cable 100% fine stranded PURE COPPER cable for high amperage applications Copper cable lugs are tinned coated and utilize a closed end design for corrosion protection. Polyolefin heat shrink tubing applied to form a protective seal. Includes one black cable and one red cable. Simply select cable length and cable lug mounting hole diameter for cable ends.