Martin MM13 Retro Monel Acoustic Guitar Strings – Medium 13-56

Retros are the original Nickel acoustic strings, dating all the way back to the 1930s. Retro strings offer a uniquely mellow yet crisp sound that allows your guitar’s natural tonewoods to be heard. They are crafted with Monel, a solid nickel/copper wrap wire – not nickel-plated – meaning there is no chance for defects in the plating to allow for corrosion. Martin’s proprietary wrap wire is naturally corrosion-resistant and it is incredibly strong. Martin also employs a sophisticated winding process that controls the coupling between the core and wrap wire to maximize intonation. String Gauges: .013, .017, .026, .035, .045, .056.