Gauges 40-60-75-95. D"Addario XL Chromes Flatwound Bass strings are famed for their smooth feel and great tone. The strings are wound and then polished to produce an incredibly smooth surface. 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.