Gauge: .50. D"Addario XL electric bass strings are wound with nickelplated steel, known for its distinctive bright tone and excellent intonation. The smooth, comfortable surface prevents premature fret ware. Great for rock and jazz. 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 that"s right for you.