Martin M550 Phosphor Bronze Acoustic Guitar Strings, Medium (13-56)
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.
- Gauges: 0.13 - .056
- Bronze alloy for brilliance and long life