D'Addario EXL280 XL Nickel Wound Piccolo Electric Bass Guitar Strings. Gauges: 20p-32-42-52. Long scale. Round-wound. Nickel-plated steel wrap wire. Provides a bright, true sound. 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 you.