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D’Addario EJ13 80/20 Bronze Acoustic Guitar Strings provide precise intonation, excellent tuning stability, and maximum durability. These strings have become richly popular stems of their sparkle trebly tone that has been adored since the 1930s when they were developed by John D'Addario Sr. and guitar maker John D'Angelico. This is made possible through the special engineering of a high carbon steel core paired with 80/20 bronze wrap wire for remarkable depth and expansive harmonic capabilities that work together to project sound loud and clear. 11-52 Custom Light gauge strings bring a volume boost but are still easy to play for an unparalleled shine - no wonder these strings had over 90 years of history of being on top!