Augustine Strings for classic guitar Classic Label - Set Classic Blue (normal/high)Augustine produces 4 different series of classical guitar strings The best known Classic sets (black, gold, red and blue) have identical nylon trebles in normal tension, the sets differ in the different tensions of the wound bass strings (black = low, gold = medium, red = medium, blue = high). This logic is continued in all subsequent series. All strings marked GOLD have a gold coloured winding of brass plated copper bass strings in medium low tension