STRING SET FOR ELECTRIC GUITAR String Set for XL Series Electric Guitar Nickel Wound Super Light Top / Regular Bottom (009 - 011 - 016 - 026 - 036 - 046) - (Pack 3 sets). D Addario XL Strings for Electric Guitars 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 distinctive, brilliant tone and excellent intonation.