ELECTRIC GUITAR STRINGS SET XL Series EXL115W Nickel Wound Electric Guitar Strings Set, Medium / Blues Jazz Rock (011 - 014 - 021 - 028 - 038 - 049). The D'Addario EXL115W strings combine the caliber of the popular EXL115 with a wound third string, offering a full, meaty tone, flexible and durable. 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, brilliant tone and excellent intonation.