Renogy One Pair of 9 Inch 12AWG Adaptor Kit Solar Cable Wire PV with MC4 Female & Male Connectors  Connect Solar Panel and Charge Controller 9in 12AWG adaptor kit Mc4 connectors (male and female) Hard plastic connectors at each end Black wire sunlight resistant Cable Extends and locks built-in cables Two cables with Mc4 connects at one end connecting to solar panel and bare on the other end connecting to charge controller.