STRING SET FOR ELECTRIC GUITAR String Set for Electric Guitar XLNickel Bound Series, Regular Light (010 - 013 - 017 - 026 - 036 - 046) Double Ball. 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 on a hexagonal shaped core , resulting in strings with a distinctive, bright tone and excellent intonation.