Gauges 13-17-26-35-45-56.Martin M550 Phosphor Bronze Acoustic Guitar Strings are made with a unique composition to give brilliance, clarity, and longevity of sound. The Phosphor Bronze winding alloy is ideally suited for making strings that have deep, rich basses and clear, bright trebles. Martin Strings are high-quality strings for daily use. Core and wrap wires must meet strict requirements to make the grade. Martin Strings are wound to precise specifications.

Dunlop uses the finest wire available combined with unique core-to-wrap formulas to create a 12-string set that is durable, sounds brilliant and defined, and is easier on the fingers due to lower tensions. Like all Dunlop Strings, these phosphor bronze acoustic strings break in fast and are exceptionally long-lived so you can spend more time playing and less time changing your strings.

Gauges 12-16-24-32-42-53. Known for their crisp bright tone, 80/20s are popular with stage and studio pros. 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 acoustic guitar.