D'Addario EJ98 black nylon Cuatro strings are designed for the 4-string Venezuelan cuatro, traditionally tuned in similar fashion to the ukulele with slight octave variations. D'Addario offers a wide variety of ethnic instrument strings designed to the exacting specifications of our artists, instrument parterns and international customers. Our computer-controlled winding machinery, laser micrometer inspection, and closed-loop tension control systems promise unrivaled quality and consistency, set after set.