WindyNation 10 Gauge 10 AWG One Pair 40 Feet Black + 40 Feet Red Solar Panel Extension Cable Wire MC4 Connector One pair ( 1 piece black + 1 piece red ) of UL Listed solar cable. Both solar cables are terminated with MC4 Connectors. SEE IMAGE #2 in the photo gallery for 10 AWG and 12 AWG solar cable specifications Photovoltaic module interconnection cable for use with or without a raceway in accordance with the Wiring Systems, Article 690 in the National Electric Code (NEC), NFPA 70. UL Listed solar cable is designed for outdoor use and is moisture, UV and corrosion resistant. Solar cable is manufactured in the USA. Solar extension cable is typically sold in 16, 14, 12 and 10 AWG sizes. The solar cable offered in this listing is 12 AWG and 10 AWG which are the two largest sizes of the four. Using large diameter cable minimizes power loss in your solar panel system.