EJ64s are manufactured specifically for the 4-string dulcimer and its unique picking and stemming styles. D'Addario offers a wide variety of ethnic instrument strings designed to the exacting specifications of their artists, instrument partners, and international customers. D'Addario's computer-controlled winding machinery, laser micrometer inspection, and closed-loop tension control systems promise unrivaled quality and consistency, set after set. Designed specifically for the 4-string dulcimer Contains 3 plain steel strings and one nickel-plated steel wound on steel string Distinctive bright tone and excellent intonation Packaging that is environmentally friendly and corrosion resistant for a fresh set of strings every time Manufactured in the USA for the highest level of string quality and performance