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Martin Era MP550T medium-gauge (13-56) phosphor bronze acoustic guitar strings are built for superior tone and playability. These strings feature a patented Lifespan treatment to protect against corrosion, ensuring long-lasting performance. The Flexible Core construction enhances fretability and comfort, while silk-wrapped ball ends provide a premium touch designed to protect vintage instruments. Combining the best technologies from the Martin lineup, these strings offer a high-quality solution for players seeking durability and professional feel. Upgrade your instrument with Martin's handcrafted string-making expertise for a premium acoustic experience.