The Hopkins Towing Solutions Bonded Trailer Wiring is ideal for all your common wiring needs. It is made of 100 percent copper and features 16/18 gauge construction with 16 gauge on the ground and 18 on all others. It also has four conductors. This trailer hitch wiring comes with functions printed on each cable.
Hopkins Towing Solutions 25 feet of 16 Gauge 4 Conductor Wire, 49915: 
 

 
 
For all basic wiring needs
 
Copper 4 wire bonded
 
Printed functions on wire
 
25 feet
 
Wire Gauge 16