D"Addario ECB81-5 Chromes XL Bass Flatwood Strings are in gauges 45-65-80-100-132. These bass guitar strings have a high finish ribbon wound, soft gauge, and long scale. 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.