Gauges 45-65-80-100. D'Addario EXL170 Bright Bass Strings are among D'Addario's most popular round-wound, nickel-plated electric bass strings. World-renowned as "The Player's Choice" among bass players of all genres and styles. XL strings are round wound with nickel-plated steel, known for its distinctive bright tone, excellent intonation, and reduced fret wear. 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 bass strings that's right for you.