D"Addario roundwound EXL160TP Twin-Pack Bass Guitar Strings have a nickel-plated steel wrap and produce bright, accurate sound and prevent premature 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 bass guitar.