TREATED FOR A LONG LIFE: These heavy-duty guitar strings are engineered using a new, patented anti-corrosion treatment which protects the core and wrap wire without compromising tone, tune, or feel. STRING SOUNDS: Designed to bring out a full and balanced tone from your guitar, these bronze acoustic guitar strings can be used for fingerpicking, pick playing, and other methods. Play with these strings for any genre—rock, bluegrass, country, folk, blues, and more. LIGHT ACOUSTIC STRINGS: Measuring from a 0.012" high E string to a 0.054" low E string, these are high-quality acoustic guitar strings that brighten the natural tuning of your guitar, including tenor, mid-tones, and bass. They feature a tension of 168.5. AUTHENTIC ACOUSTIC TREATED: With Martin Authentic Acoustic, you get a total set of strings designed for performance and playability. Martin guitars and accessories remain the choice for musicians around the world for their unrivaled quality, craftsmanship, and tone.