D'Addario's premium uncoated acoustic string set that provides a crisp and clear sound to accentuate the unique tone of your guitar. NB1253 delivers the ideal balance of volume, projection and comfortable playability. Delivers a full tonal spectrum, revealing the unique tonal qualities of your acoustic guitar Increased corrosion resistance for a longer lasting uncoated string Features D'Addario's exclusive high-carbon NY steel for unprecedented strength and tuning stability environmentally-friendly, corrosion-resistant packaging keeps strings fresh Made in the U.S.A. for the highest quality and performance String Gauges: Plain Steel .012, .016, Nickel Bronze Wound .024, .032, .042, .053