A new tone resonates. The ultimate acoustic strings, supervised by John Mayer. Developed in collaboration with John Mayer, Ernie Ball Earthwood Bell Bronze strings are crafted to meet John's exacting standards and will bring a new level of resonance to your acoustic guitar. Made with a proprietary blend inspired by the alloys used in bells and sympals, these strings deliver a rich, full-bodied sound that stands out in the Ernie Ball lineup. These strings will breathe new life into your guitar! Product features: Co-developed with John Mayer. Powerful, rich sound. Design inspired by the alloys used in bells and cymbals. Superior resonance and sustain for a more expansive sound. Made with Ernie Ball's proprietary, patent-pending alloy. 13, 17, 26, 34, 46, 56 John Mayer's comment: "Earthwood Bell Bronze strings represent a quantum leap in tone, playability, and durability. They're great for any musical setting, but they really shine in solo performances. They have an orchestral quality." "I've always said that you don't play the guitar, you play the strings. Having a fluid feel is very important to my playing, and Ernie Ball strings have always given me that ability."