Historic stainless flatwound guitar strings. Great for jazz, but also used for many other styles of music.
Benefits of Flatwound Strings:
-Consistent tone over the life of the strings
-Less Fret wear
-Smooth surface causes less "squeaking" and easier on fingers
-Last longer than round wound strings, trade off in price.
Excellent choice, highly recommended - our luthier purchased several sets fo himself after he installed mine.