Retros are the original Nickel acoustic string, all the way from the 1930s. Retro strings give a mellow, yet crisp, sound that allows your guitar’s natural tone woods to be heard instead of overshadowed. They are crafted with Monel, a solid Nickel/Copper wrap wire, not nickel-plated, so no corrosion. Martin Retros give you one tough set of strings that will last a long time and give you true, consistent tone that sounds like nothing else on the market.
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