BASS STRING SET Set of 2 sets of XL Series Round Wound Bright bass strings, Super Light, super long scale (040-060-075-095). D'Addario XL Nickel bass strings are world renowned as '' The Bassist's Choice '' whatever style it plays. XL strings are wound with great precision with nickel plated steel onto a hexagonal shaped core, resulting in strings with a distinctive, brilliant tone and excellent intonation. Nickel-plated steel wire wound to the core is known for its distinctive bright tone and excellent tuning for all styles.