These cables are used between photovoltaic arrays with UL Listed Multi-Contact (MC4, Solarline2) cable connectors.  These extension cable are 50' or 100' long.  The wire is a black UL listed 4703, 44, 854 and CSA Spec. C22.2, No. 38-05 19 strand 8 AWG sunlight resistant and RoHS compliant 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.