D'Addario NB1152 Nickel Bronze Acoustic Guitar Strings, Custom Light Delivers a full tonal spectrum, revealing the unique tonal qualities of your acoustic guitar Increased corrosion resistance for a longer lasting uncoated string Feature DAddarios 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