Brand new set of acoustic guitar strings for musicians seeking quality sound. These Martin SP strings are crafted to deliver maximum tone and longevity, featuring ultra-high tensile strength steel cores that resist breaking. The phosphor bronze material provides a great string life, making these medium gauge strings (.013 - .056) ideal for live performances, studio recording, or just sustained playability wherever your music takes you. Perfect for guitarists seeking a balanced and rich acoustic tone in various musical settings.