D’Addario’s premium uncoated acoustic string set that provides a crisp and clear sound to accentuate the unique tone of your guitar. NB1256 combines medium gauge bottom strings for increased resonance and volume with light gauge top strings for more comfortable playability and single note bending. 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 .025, .035, .045, .056