Martin Authentic Acoustic Lifespan 2.0 Treated Phosphor Bronze Strings

The Lifespan 2.0 is the treated version of Martin's Superior Performance Authentic Acoustic strings. They use 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. We prefer the Phosphor Bronze sets to the 80/20—they sound warmer and fuller on just about every guitar we try. These are impressive strings, and it's clear that C.F. Martin's standards for acoustic guitar tone are embedded in their string design and precision manufacturing process.  Gauges: Light: .012 - .016 - .025 - .032 - .042 - .054 Medium: .013 - .017 - .026 - .035 - .045 - .056 12-String Extra Light: .010-.010 - .014-.014 - .023-.010 - .030-.012 - .039-.018 - .047-.027