D'Addario EJ14 80/20 Bronze Acoustic Guitar Strings, Light Top/Medium Bottom/Bluegrass, 12-56 A D'Addario hybrid gauge combining medium bottom strings with light top strings for a big sound with comfortable playability Extra-bright tone mixed with deep and projecting bottom end Corrosion resistant packaging for strings that are always fresh Made in the U.S.A. for the highest quality and performance String Gauges: Plain Steel .012, .016, Bronze Wound .025, .035, .045, .056