Optimized for Concert Ukuleles tuned to standard GCEA tuning Pro-Arté Custom Extruded Nylon for highly accurate, laser sorted treble strings Inspired and guided by D’Addario ukulele artist Jake Shimabukuro | Concert 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 |