Martin MA550T Lifespan 2.0 Phosphor Bronze 13-56

Next 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. Martins impeccable standards for acoustic guitar tone are embedded in their string design and precision manufacturing process.