D'Addario EJ65S is a complete set made entirely of nylon, designed for use with soprano ukuleles. Each string is produced on D'Addario's own advanced monofilament extrusion facility, which is exclusively built for the production of musical instrument strings. This set is optimized for the traditional ADF#B tuning. All custom-extruded nylon sets are manufactured on D'Addario's own advanced monofilament extrusion line. Each set features exclusive laser-sorted Pro-Arté treble strings made from clear nylon for unparalleled intonation with a warm, projecting acoustic tone. Optimized for soprano ukuleles tuned to the traditional ADF#B tuning. Pro-Arté custom-extruded nylon for high-precision, laser-sorted treble strings. D'Addario's most popular ukulele set, known for its warm and long-lasting tone. Soprano ukulele, Pro-Arté custom-extruded clear nylon, non-ball end. String gauges: Nylon .024, .032, .034, .028. Made in the USA for the highest quality and performance.