Clapton's Choice Phosphor Bronze guitar strings have 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 by Eric Clapton. These new strings are available in light and medium gauged sets. "When I play acoustic guitar, whether in a studio or on stage, these Martin Strings are my choice. They deliver the sound that I demand." MEC12 - 012/054 MEC13 - 013/056