Eric Clapton loves his Martin acoustic guitar strings so much that he wanted to endorse them. We are proud and honored that Martin Guitar makes the strings that Eric trusts to produce his legendary guitar sounds. 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.” Music to our ears. 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.