Developed in collaboration with John Mayer, Ernie Ball Earthwood Bell Bronze strings have been carefully crafted to meet John's exacting standards, providing a new voice for your acoustic guitar. Inspired by alloys used traditionally for bells and cymbals, Ernie Ball's proprietary Bell Bronze acoustic guitar strings offer a richer, fuller sound than any other string in their catalog. These strings will breathe new life into your guitar! Gauges .012, .016, .024w, .032, .044, .054
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