RC Strings have been popular in Spain for many years. A limited production line of "boutique" strings, they have been used by Tomatito, Oscar Herrero, Carlos Bonell, Edoardo Catemario.
RC Strings UXSC90 Ukulele Strings Excel Soprano or Concert, Full Set
RC Strings soprano or concert ukulele strings made of titanium. Full 4-string set.