Part of the Ernie Ball Cobalt Slinky Guitar Strings Series, the 2730 Cobalt 7-String Top Heavy Bottom Electric Guitar Strings are engineered to maximize output and clarity, and are the latest innovation in string technology. Seeking to provide guitarists and bassists with a new voice, Cobalt strings provide an extended dynamic range, incredible harmonic response, increased low end, and crisp, clear highs. Cobalt provides a stronger magnetic relationship between pickups and strings than any other alloy previously available. Cobalt Slinkys are also soft and silky to the touch, making string bending a breez