D'Addario Tenor guitar strings are made specifically for steel string Tenor Guitars. EJ66 Tenor Guitar strings are made from Plain Steel and 80/20 Bronze wound strings which provide bright, projecting acoustic tone. 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.