EXL115Ws are among D'Addario's most popular round-wound, nickel-plated electric guitar strings.World-renowned as "The Player's Choice" among guitar players of all genres and styles. XL strings are wound with nickel-plated steel, known for its distinctive bright tone, excellent intonation and reduced fret wear. D'Addario is the world's largest manufacturer of strings for musical instruments. Many top guitarists won't play any other brand. Whether you play blues, jazz or rock, D'Addario has a set of strings that's right for your electric guitar. Player's choice, Nickel round wound, Bright lasting tone.