Ernie Ball 2730 7-String Cobalt Electric Guitar, Skinny Top Heavy Bottom (10 - 62)
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 : .010, .013, .017, .030, .042, .052,  .062