Eric Clapton loves his Martin acoustic guitar strings so much that he wanted to endorse them. What does Eric have to say about Martin Strings? "When I play acoustic guitar, whether in a studio or on stage, Martin Strings are my choice. They deliver the sound that I demand." Available in light and medium gauge 92/8 Phosphor Bronze. Eric Clapton strings are approved for studio and stage, engineered to resist corrosion with legendary tone and playability.