Making a marriage of a hexagonal-shaped steel core string with a nickel-plated steel winding wire for the utmost in tone and durability, the Ernie Ball 2221 Regular Slinky Electric Guitar Strings are an industry standard that have reigned for decades. Used by legions of players from Eric Clapton to John Mayer, the even-keeled tone and durability found here make these a favorite of players from all genres.