Clapton's Choice: Designed in collaboration with legendary guitarist Eric Clapton, these Martin MEC13 strings deliver the signature sound and feel he prefers for his acoustic guitar. Premium Phosphor Bronze: Crafted with high-quality phosphor bronze, these strings offer exceptional tone, warmth, and a balanced projection, enhancing your guitar's overall sound. Medium Gauge: The medium gauge (.013-.056) strikes a perfect balance between playability and tone, providing a comfortable feel while offering a full-bodied and expressive sound. Enhanced Resonance and Sustain: Experience enhanced resonance, sustain, and clarity with these premium acoustic guitar strings, allowing your music to ring out with rich and vibrant tones. Long-Lasting Performance: These strings are built to last, offering excellent durability and consistent performance, even with frequent playing and extended sessions. Versatile Application: Suitable for various playing styles and musical genres, these Clapton's Choice strings are a reliable choice for professionals and hobbyists alike. Expertly Crafted: Each string is carefully constructed with precision, ensuring excellent intonation, reliable tuning stability, and a comfortable playing experience. Perfect Upgrade or Replacement: Whether you're looking to upgrade your current strings or replace worn-out ones, the Martin MEC13 Clapton's Choice strings are an excellent choice.