Historic stainless flatwound guitar strings in gauges 9-9-12-12-20p-9-26-12-36-20p-46-26. 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.