D'Addario EJ88C sets are designed for use with all concert ukuleles. Each string within this set is made from D'Addario's exclusive Nyltech material, developed in cooperation with Aquila.Nyltech strings are an exclusive combination of materials designed to deliver an optimal combination of warm, yet punchy gut-like overtones, comfortable playability, precise intonation and tuning stability. This set is optimized for standard GCEA tuning with gauges .024, .031, .037, .026