Optimized for Soprano Ukuleles tuned to standard GCEA tuning Black precision rectified nylon ensuring that the roundness and dimension control of each string are unsurpassed Preferred for their warm and long lasting tone | Soprano Ukulele, Rectified Black 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 |