“A giant leap forward in tone, playability, and durability”: John Mayer has developed a new acoustic string set with Ernie Ball, and it's designed to be ideal for solo performers

John Mayer performs onstage at the Kia Forum in Inglewood, California on April 14, 2023 (left), Ernie Ball's new Earthwood Bell Bronze guitar strings, on display at the 2025 NAMM Show in Anaheim, California
(Image credit: Elyse Jankowski/Getty Images, Michael Astley-Brown/Future)

NAMM 2025: Last October, John Mayer joined forces with Ernie Ball to launch the Silver Slinky set, a set of electric guitar strings boasting a unique in-between gauge and a custom core-to-wrap ratio.

Our own Senior Staff Writer, Matt Owen, happened to get his hands on a set, and said that the Silver Slinky package ended his years-long quest to find the perfect set of Stratocaster strings.

Now, the Silver Sky-slinging guitar hero and pop star has joined forces with Ernie Ball once again for something a little different – the Earthwood Bell Bronze set of acoustic guitar strings. From the way its co-creator speaks about the strings, it seems they may get similarly revelatory reviews.

“Earthwood Bell Bronze strings are a giant leap forward in tone, playability, and durability,” Mayer says of the set. “They’re great in any musical setting but really shine when played solo. There’s an orchestral quality to them.”

Acoustic Earthwood Bell Bronze Demo on a Gibson L-00 - YouTube Acoustic Earthwood Bell Bronze Demo on a Gibson L-00 - YouTube
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Not that we don't believe him, obviously, but what would make someone channel Neil Armstrong when speaking about a string set?

Well, Ernie Ball says it all starts with how they were inspired by alloys traditionally used for bells and cymbals. Ernie Ball says that this, in turn, leads to a bigger sound, with better sustain, projection, and resonance.

The alloy Ernie Ball ended up creating with that percussive inspiration is patent-pending, and the company says it helps produce “a richer, fuller sound than any other string in our catalog.”

Ernie Ball's new Earthwood Bell Bronze string sets will be available in four gauge combinations: Extra Light (10-50), Light (11-52), Medium Light (12-54), and Medium (13-56), starting this spring. Their price hasn't been announced as of yet.

Mayer's not the only 21st century guitar hero to unveil new Ernie Ball guitar strings at NAMM this year. He's joined by Polyphia's Tim Henson, who unveiled a signature string and accessory set of his own at the show's opening yesterday (January 23).

For more info on both string sets, visit Ernie Ball.

Jackson Maxwell

Jackson is an Associate Editor at GuitarWorld.com. He’s been writing and editing stories about new gear, technique and guitar-driven music both old and new since 2014, and has also written extensively on the same topics for Guitar Player. Elsewhere, his album reviews and essays have appeared in Louder and Unrecorded. Though open to music of all kinds, his greatest love has always been indie, and everything that falls under its massive umbrella. To that end, you can find him on Twitter crowing about whatever great new guitar band you need to drop everything to hear right now.

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