D'Addario EJ65S is an all-nylon set designed for use with soprano ukuleles. Each string is manufactured on D'Addario's own advanced monofilament extrusion line built exclusively for the production of musical instrument strings. This set is optimized for usage with traditional ADF#B tuning. Each set features their exclusive laser-sorted Pro-Art clear nylon trebles for unsurpassed intonation with a warm, projecting acoustic tone.