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;Classic Red Label normal/medium tension;Standard treble strings in normal tension;Silver-plated bass strings in medium tension;Diameter and tension:;E1 normal: .028"/0.71mm, 7.81kg/17.21lbs;B/B2 normal: .032"/0,81mm, 5,84kg/12.88lbs;G3 normal: .040"/1.01mm, 5.56kg/12.25lbs;D4 medium: .0295"/0.75mm, 7.2kg/15.89lbs;A5 medium: .035"/0.89mm, 6.9kg/15.27lbs;E6 medium: .0425"/1.13mm, 6.68kg/14.72lbs;