D'Addario EJ53B strings are designed specifically for baritone ukuleles. The 3rd and 4th string are a silver-plated copper wound on nylon complimented by a 1st and 2nd string which are made from our black precision rectified nylon. This black precision rectified nylon ensures that the roundness and dimension control of each string are unsurpassed. Each black nylon string is carefully center-less ground to an ultra-smooth, ultra-precise final diameter for excellent feel and unparalleled intonation with a warm, long lasting acoustic tone. This set is optimized for standard DGBE tuning.