Unique 21+ Martin Sp Acoustic Guitar Strings
Unique 21+ Martin Sp Acoustic Guitar Strings. The martin sp lifespan acoustic strings are a case in point. Enjoy the lowest prices and best selection of martin 6 string sets for acoustic guitar at guitar center. The phosphor bronze winding alloy is ideally suited for making strings that have deep, rich basses and clear, bright. Martin msp4100 phosphor bronze light acoustic guitar strings are made from a 92/8 composition alloy to give that brilliance, clarity, and longevity of sound required by serious guitarists.