Martin .013 - .056 Clapton's Choice Acoustic Guitar Strings Clapton's ChoicePhosphor Bronze guitar stringshave a distinctively clear, warm tone with a hint of brightness that can highlight the subtleties of a player's style. Live or in the studio, they deliver the performance expected byEric Clapton. These new strings are available in light and medium gauged sets. 'When I play acoustic guitar, whether in a studio or on stage, theseMartin Stringsare my choice. They deliver the sound that I demand.'