X-SERIES STRINGS The X-Series is the new industry standard in guitar strings featuring unprecedented longevity. Using an ultra-thin film to protect against corrosion without dampening your tone, XS provides a uniquely smooth feel and maximum life. XT is designed to feel like an uncoated string, offering extended life using a thin, hydrophobic treatment. XT COATED STRINGS: Natural feel - Extended Life – Over average, lasts up to 3x longer than standard strings - Improved break resistance and tuning stability - Available for acoustic, electric, bass, classical, banjo, mandolin, and resophonic D'Addario XT strings combine high carbon steel cores with an advanced corrosion resistance treatment, giving you enhanced break resistance, pitch stability, and long-lasting performance – all while preserving the tone and feel of your favorite uncoated strings. These are strings made to stay, with uncompromising performance that never fades away.