Gauges 24-34-44-56-72-84. D"Addario XL strings are wound with nickelplated steel, known for its distinctive bright tone and excellent intonation. D"Addario is the world"s largest manufacturer of strings for musical instruments. Many top guitarists won"t play any other brand. Regardless of your playing style, D"Addario has a set of strings that"s right for your guitar or bass.