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ERNIE BALL 2002 老鷹牌 80/20 黃銅 MEDIUM 木吉他弦（13~56）民謠吉他弦
Made from 80% copper, 20% zinc wire wrapped around hex shaped brass plated steel core wire.
These acoustic guitar strings provide a crisp, ringing sound with pleasing overtones.
Gauges .013, .017, .026, .034 .046, .056