This is a set of original flat chrome orchestra tuning (G.D.A.E) strings. They are used and have been used for about a year and a half. The blue and white winding on the D and A strings has darkened due to mute degradation, but there are no issues with use. They have become somewhat stiff, but they are thick and durable strings, so I think they can still be used. Recommended for those who want to try strings or want to save money.