Martin Retro Acoustic Strings provide unrivaled quality, craftsmanship, and tone for your acoustic guitar. Designed to produce a true, consistent tone, these extra-light-gauge strings provide incredible note separation and balance, allowing your guitar's natural wood tones to shine. Made from a solid nickel-copper alloy blend, these strings feature Martin's proprietary Monel wrap wire for enhanced longevity and durability. Naturally corrosion resistant, they provide tuning stability so they can hold up after hours and hours of playing. This total set of professional-grade guitar strings will last through long jam sessions, late-night campfire songs, and plenty of picking. Designed to bring out a sweet, mellow tone from your guitar, these nickel-copper guitar strings can be used for finger-style blues, Americana, country, bluegrass, ragtime, and many more styles. They sound great plugged into an acoustic-electric guitar or played with a guitar slide. With this pack, you'll receive 12 extra-light-gauge guitar strings. The low E string measures 0.047", the A string measures 0.038", the D string measures 0.029", the G string measures 0.023", the B string measures 0.013", and the high E string measures 0.010". This total set of extra-light-gauge strings features a tension of 131.63 and makes it easy to get a mellow, bright tone out of your guitar. Martin Guitar has been producing high-quality, musician-choice guitars and guitar accessories since 1833. The Martin Retro Acoustic Extra-Light-Gauge Guitar Strings are the real deal-not an imitation. Discover your guitar's true voice with this professional-grade guitar string pack.