Medium Acoustic Guitar String Tone Pack. A perfect way for players to experience three legendary acoustic guitar tones. Contains one set each of Medium Light Earthwood 80/20, Earthwood Phosphor Bronze and Aluminium Bronze strings Earthwood 80/20 Bronze strings, featuring a crisp ring, Earthwood Phosphor Bronze Strings, providing warm and rich overtones, Ernie Ball's exclusive Aluminium Bronze Strings, which give your guitar more projection and clarity than ever before.