The Martin M540 Light Acoustic Guitar Strings Phosphor Bronze - These phosphor bronze wound strings have a warmer, earthier tone than Martin's standard bronze strings, and tend to be a bit longer lasting too.
The Martin M540 Light Acoustic Guitar Strings Phosphor Bronze for acoustic guitar.* Full set of phosphor bronze / steel strings from the world's most famous acoustic guitar maker.
* Light - Gauges 12, 16, 25, 32, 42, 54