Martin Authentic Acoustic Lifespan 2.0 Phosphor Bronze Medium 13-56

Martin Authentic Acoustic Lifespan 2.0 Phosphor Bronze Medium 13-56Model MA550TNext generation Martin® Authentic Acoustic® Lifespan® 2.0 strings are engineered using a new, patented anti-corrosion treatment only available from Martin. It protects the core and wrap wire to prevent corrosion without compromising tone or feel. Our impeccable standards for acoustic guitar tone are embedded in our string design and precision manufacturing process. That’s why we make our own.String Gauges : Medium.013, .017, .026, .035, .045, .056Tension 190.9