Martin MTR13 Retro Monel Bluegrass .013
Tony's Choice Retro acoustic guitar strings are made with tin-plated steel core wire and solid Monel wrap wire - a proprietary blend of nickel and copper - that is naturally corrosion resistant. Martin offers modified gauging on the B, D, and A strings for modern playability. The modified gauging makes the string easier to play with a more balanced feel and clear intonation.
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