D'Addario EJ94 Requinto Strings Designed specifically for Requinto guitars and tuning Rectified clear nylon and silver-plated copper wound on nylon strings Warm and projecting, long lasting tone Made in the U.S.A. for the highest quality and performance String Gauges: Clear Nylon: .022, .028, .033, Silver-plated Copper: .025, .030, .036