D'Addario J65 strings are designed for use with soprano ukuleles. Each string is made from our clear precision rectified nylon utilizing our proprietary center-less grinding technique which ensures that the roundness and dimension control of each string are unsurpassed. The result is a ukulele set with a warm and long lasting tone guaranteed to have absolutely perfect intonation each time. This set is optimized for usage with traditional ADF#B tuning.