OPTIMIZED FOR SOPRANO UKULELES TUNED TO TRADITIONAL ADF#B TUNING-. PRO-ARTÉ CUSTOM EXTRUDED NYLON FOR HIGHLY ACCURATE, LASER SORTED TREBLE STRINGS. PRO-ARTÉ CUSTOM EXTRUDED NYLON FOR HIGHLY ACCURATE, LASER SORTED TREBLE STRINGS. SOPRANO UKULELE, PRO-ARTÉ CUSTOM EXTRUDED CLEAR NYLON, NON-BALL END. MADE IN THE U.S.A. FOR THE HIGHEST QUALITY AND PERFORMANCE. ENVIRONMENTALLY FRIENDLY, CORROSION RESISTANT PACKAGING FOR STRINGS THAT ARE ALWAYS FRESH.