Adamas 1717E Phosphor Bronze Acoustic Guitar Strings - Extra Light Gauge Item #: ADM 1717E 

Designed from the inside out for balanced performance in tone and feel, the Adamas Phosphor Bronze wrap wire produces a rich, full sound with even tone throughout the harmonic range, while Composite Gauging provides for a set that is consistent in tension and amplitude from string to string.

Significant changes have been engineered into the fifth and sixth strings.
These strings utilize core and wrap wire of identical size so that neither part of the string dominates the various modes of string vibration. Thus, the strings vibrate more consistently and with greater amplitude to produce a sharper, more precise tone.