Classic (low tension) treble strings with Blue (high tension) bass strings
Augustine Blue Label classical guitar concert strings feature heavy bass strings and low tension treble strings. They generally produce a strong and loud bass response, with a softer treble response and volume. Blue basses have Augustine's heaviest copper windings, for higher string density. The treble strings are Albert Augustine's Classic, low tension nylon strings, his original design he created for Andres Segovia in 1947. Blue Label strings work well on classical guitars that need more bass volume to balance the string volumes, or when a strong bass voice is desired by the guitarist.