Historic stainless flatwound guitar strings in gauges 10-10-14-14-17p-9-26w-12-36-17p-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.