BASS STRING SET Set of 2 sets of 5 strings for bass XL Series Nickel, Bright Round Wound, Regular Light, super long scale (045 - 065 - 080 - 100 - 130). 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 fine tuning for all styles.