ELECTRIC GUITAR STRING SET String Set for XL Series Electric Guitar Nickel Wound Regular Light - (011 - 014 - 019 - 032 - 044 - 056). 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 precision wound onto nickel plated steel over a hexagonal shaped core, resulting in strings with a distinctive, brilliant tone and excellent intonation. This game is optimized to use Drop D tuning.