UKELELE STRING SET D Addario EJ88C Nyltech Concert string set designed for use with all concert ukuleles. Each string in this set is made from our exclusive Nyltech material and optimized for standard GCEA tuning. Developed in collaboration with Aquila, the Addario Nyltech D strings are an exclusive combination of materials designed to offer an optimal combination of warm tone, but punchy, comfortable playing, precise intonation and tuning stability not found in other ukulele strings. Gauges: 0.024, 0.031, 0.037, 0.026. Made in EE.UU. for the highest quality and performance.