Delivers a full tonal spectrum, revealing the unique tonal qualities of your mandolin. Increased corrosion resistance for a longer lasting uncoated string. Feature 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 .010, .015, Nickel Bronze Wound .024, .038.