The Ernie Ball Earthwood 12 String 80/20 Bronze Acoustic Guitar Strings are made from 80% copper, 20% zinc wire wrapped around hex shaped brass plated steel core wire. The 80/20 mix gives these acoustic guitar strings a bright, crisp ringing sound with pleasing overtones. They're made by Ernie Ball in their California factory using state of the art winding technology for consistency and reliability and are packaged in their watertight element shield packaging to resist humidity and keep your strings factory fresh. For the .009 - .046 set the string gauges are .009 .009, .012 .012, .020w .009, .026 .012, .036 .020p, .046 .026, and for the .011 - .052 set the string gauges are .011 .011, .015 .015, .024w .010, .030 .014, .042 .022w, .052 .028

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