The string was developed with the advice and feedback of Andrés Segovia, the most renowned classical guitarist of the 20th Century. Modern extrusion technology now allows Augustine Strings to offer the original nylon treble formula but with perfect intonation. The Augustine Classic Treble comes in our Blue, Red, Black, and Gold. They have a warm, round, mellow tone that is preferred by artists looking for the traditional “Segovia Sound” of that era. In fact, it was decades before alternative nylon and carbon fiber materials were introduced for classical guitar strings. So when one listens to the recording of the early legends of the classical guitar – Segovia, Julian Bream, John Williams or the infamous Brazilian duo the Abreu Brothers, they are hearing the Classic Treble.