Ernie Ball 2729 7-String Cobalt Electric Guitar, Power Slinky (11 - 58)
Engineered to maximize output and clarity, Ernie Ball Cobalt Slinky Guitar Strings are the latest innovation in string technology. Seeking to provide guitarists with a new voice, Cobalt Electric Slinky strings provide an extended dynamic range, incredible harmonic response, increased low end, and crisp, clear highs. Gauges : .011, .014, .018p, .028, .038, .048,  .058