Dunlop Americana Strings like these Phosphor Bronze Resonator guitar strings, capture the sound and feel of America's finest musical traditions. These phosphor bronze resonator strings sound clear and defined with bass strings that growl and treble strings that sing with brilliant harmonic detail. Dunlop meticulously balances every set to give you a range of rich, full tones and a comfortable feel that lets the notes flow freely from your fingertips. To keep your strings factory-fresh, they are packaged in a VCI bag that keeps moisture out.