These cables are used between photovoltaic arrays with UL Listed Multi-Contact (MC4, Solarline2) cable connectors.  This extension cable is 50' long.  The wire is a black UL listed 4703 37 strand 10 AWG sunlight resistant cables.  They have a male connector on one end and a female connector on the other end.  Use them to extend module output cables or cut anywhere along the wire to obtain the needed length of male and female cable to run from string of modules to a combiner box or to a longer cable.  Made in USA. Shipping weight 3 lb.