BASS STRING SET 5-string bass set XL Series Nickel Wound, Bright Round Wound, Super Light, long scale - (040 - 060 - 075 - 095 - 125). 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.