D"Addario EJ88T sets are designed for use with tenor ukuleles utilizing our exclusive Nyltech material. This set is optimized for standard GCEA tuning.Developed in cooperation with Aquila, D"Addario Nyltech strings are an exclusive combination of materials designed to deliver an optimal combination of warm, yet punchy tone, comfortable playability, precise intonation and tuning stability not found in other ukulele strings. D"Addario, the world"s largest manufacturer of musical instrument strings, is known as The Players Choice with a reputation for unsurpassed quality and consistency. D"Addario"s innovative packaging reduces waste and provides protection from corrosion. All D"Addario strings are manufactured in the U.S.A. using proprietary, digitally controlled, state-of-the-art machinery for unmatched performance, set after set.