Ships from our overseas warehouse worldwide — we take care of any customs and duties on your behalf. Standard delivery to the US is 6–10 days.

Features:

1. Solid nickel/copper monel alloy wrap provides warm, mellow vintage tone with reduced pick attack and natural clarity.
2. Medium 13–56 gauges deliver bold projection, powerful volume, and increased tension for strummers and flatpickers.
3. Modified gauging on B, D, and A strings provides modern playability with balanced feel and clear intonation.

Description: Martin Retro MM13 strings are crafted from a long-lasting proprietary nickel-based alloy blend that mellows quickly to a warm vintage tone, bringing out the unique woody sounds in your acoustic guitar. The tin-plated hex core wire and solid nickel/copper wrap prevent galvanic corrosion from the inside out, ensuring extended string life without tonal compromise.

Martin employs a sophisticated winding process that controls the coupling between core and wrap wire to maximize intonation. The solid nickel/copper blend—not nickel-plated—is naturally corrosion resistant and has historically been used in marine applications, including battleship propellers. Players love these strings for their warm organic sound ideal for studio work, live performances, and versatile playing styles. The medium gauge offers power and punch without overshadowing your guitar's natural voice.