Martin MA540T .012-.054 Gauge Authentic Lifespan 2.0 Phosphor Bronze Acoustic Guitar Strings

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. Their impeccable standards for acoustic guitar tone are embedded in their string design and precision manufacturing process. That’s why they make their own.