Retros are the original Nickel acoustic string the real deal all the way from the 1930s. Retro strings offer a uniquely mellow, yet crisp, sound that allows your guitars natural tone woods to be heard, not overshadowed. 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. Instead, Martins proprietary wrap wire is naturally corrosion resistant and it is incredibly strong. 
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