Martin's Clapton's Choice Phosphor Bronze guitar strings give you the signature acoustic tone favored by one of the world's most iconic rock and blues artist. "When I play acoustic guitar, whether in a studio or on stage, these Martin Strings are my choice," says Eric Clapton, "They deliver the sound that I demand." Known for their excellent tone, brilliant clarity, and extended lifespan, Martin Phosphor Bronze string are favored by serious guitar players everywhere. Once you experience the warm and mellow tone of these Clapton's Choice Phosphor Bronze guitar strings, you'll be hooked for life.