Martin Retro strings are crafted from a long-lasting proprietary nickel based alloy blend that mellows quickly to a warm vintage tone that brings out the unique, woody sounds in your acoustic guitar. There are similar to the strings that would have been used back in the 1930s and 40s before the Bronze and Phosphor/bronze became popular and have that warm old sound that is perfect for vintage guitars or for modern guitars that you want to make sound more like a vintage instrument.

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