D'Addario XL Nickel Wound Electric Guitar strings are world-renowned as "The Player's Choice" amongst players of all genres and styles. XL's are precision wound with nickelplated steel on a hex-shaped core, resulting in strings with a distinctive bright tone and excellent intonation. Our "Plus" gauges offer a slight variation in tension between gauges. These are ideal for equalizing tension between guitars of varying scale lengths or if you're looking to jump to heavier gauges in small increments.