KAMAKA S-1 Standard & Concert 4 Strings Ukulele Strings Set "King of Ukulelele" Kamaka Ukulele. Black nylon string It can be used as a soprano/concert, so it can be used for both. A(1st).0280 E(2nd).0322 C(3rd).0403 G(4th).0280 Sold as 1 Set