Single XL Nickel Wound 130 Super Long Scale. D'Addario XL Nickel Wound Electric Bass strings are world-renowned as ''The Player's Choice'' amongst bass players of all genres and styles. All XL strings are precision wound on our exclusive digitally-controlled machines, ensuring each string has excellent intonation, clear fundamentals, and unparalleled consistency. Each string is wound with a nickelplated steel wrap wire known for distinctive bright tone with excellent magnetic output delivering a universally appealing and versatile tone for all playing styles.