SET OF STRINGS FOR ELECTRIC GUITAR Strings for 7 String Electric Guitar XL Series nickel wound super light (009 - 011 - 016 - 024 - 032 - 042 - 054). D'Addario XL Electric Guitar Strings have been recognized worldwide as '' The Guitarist's Choice '' among guitarists of all genres and styles. XL strings are wound with great precision with nickel plated steel onto a hexagonal shaped core, resulting in strings with a distinctive, shiny tone and excellent intonation.