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. XS COATED STRINGS: Smooth feel - Maximum Life – On average, lasts up to 5x longer than standard strings - Incomparable break resistance and tuning stability - Available for acoustic guitar and mandolin XS strings have an ultra-thin and durable film coating that completely protects the wound strings. Plain steel strings receive the proprietary XT treatment. This means that all the strings in the set are protected from corrosion and contaminant build-up. The coating is so thin that strings ring out with the clarity and projection similar to an uncoated string. All the strings have a smooth feel and don’t feel greasy. The strings do not visibly fray like other film coated strings.