D'Addario J68 Ukulele Strings, Baritone Optimized for Baritone Ukuleles tuned to standard DGBE tuning Clear precision rectified nylon ensuring that the roundness and dimension control of each string are unsurpassed Preferred for their warm and long lasting tone Baritone Ukulele, Rectified Clear Nylon, Silver-Plated Copper Wound, Non-Ball End Made in the U.S.A. for the highest quality and performance