The D'Addario E-Guit./Bass Strings XL156 24- 84, Nickel Wound, Fender Bass VI is a set of six strings for a Fender Bass VI guitar . The EXL156 set is a custom designed package that is tuned to E , an octave below a guitar in standard tuning. Each string is designed to bass scale lengths and tapers, but with guitar sized ball ends for retrofit on the Fender VI. The XL Nickel Wound series is one of D’Addario’s most popular strings thanks to their excellent intonation and suitability for the widest variety of guitar and musical styles. These strings are precision wound with nickel-plated steel onto a carefully drawn high-carbon steel core that is hexagonally shaped.