EXL150s are among D'Addario's most popular 12-string electric guitar strings. World-renowned as "The Player's Choice" among guitar players of all genres and styles. XL strings are 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 strings that's right for your 12-string guitar. D'Addario EXL150 Nickel XL 12-String Electric Guitar Strings Features: * Player's choice * Nickel roundwound * Bright, lasting tone Gauges 10-10-13-13-17-08-26-12-36-18-46-26.