Gauges 10-13-17-26-36-46-59. EXL110-7s are among D'Addario's most popular strings for 7-string guitars. XL strings are wound with nickel-plated steel, known for its distinctive bright tone and reduced fret wear. They're world-renowned as "The Player's Choice" among guitar players of all genres and styles. D'Addario is the world's largest manufacturer of strings for musical instruments. Many top guitarists won't play any other brand. Regardless of your playing style, D'Addario has a set of strings that's right for your 7-string electric guitar.