The D'Addario twin pack includes two sets of XL Nickel strings, each packaged in individual VCI bags to ensure freshness when it's time to restring. XL Nickel strings are the industry standard for electric bass, known for their clear fundamentals and booming, tight lows. With the dependable construction of D’Addario, they are favored by musicians globally for any performance. Constructed with a high carbon steel core and nickel-plated steel wrap wire, XL Nickel bass strings deliver a consistently bright tone and smooth playability, suitable for a diverse range of bass styles.