As I mentioned in my post on The Best of Namm 2012, Ernie Ball released a new type of guitar string- Cobalt. Not a lot was known about them but Slash, Steve Morse and John Petrucci have all posted videos for Ernie Ball discussing why they have switched to
Ernie Ball 2721 Cobalt Regular Slinky Electric Guitar Strings.
Check out the video below to learn more about the strings from Ernie Ball
Slash discusses why he is now playing Cobalts