I bought these strings as I was changing the tuning on a tenor guitar to "Irish Tuning" - similar to a mandolin.
I've always felt that you can't go wrong with Daddario, and that's the case again with these gauges. They're packed so as to avoid corrosion and have, and retain, a bright sound throughout their lifespan.
They'd have other uses also, replacement third strings for .008 gauge electric sets or second string acoustic 12 string sets, or for experimenting with gauges for 7 or 8 string guitars, or if you wanted a different feel in a 12 string set.
Sometimes changing one string in the set up or down a few thou can help you get the sound that you want.