D'Addario NYL058W Classical Guitar .058, single string

Not bad. For my violão de sete cordas, it fits nice enough as the 7th string in placement of a . 52 guage.

Good and stable sound.

I usually use a . 056 but this one does well tuned to A or even a bit lower

Good strings, good service!

Lots of makers are offering the sub-bass strings for multi-string guitars, but D'Addario is my string of choice and recommend for all multi-string guitars, because 1) They sound great, 2) they last forever!!! 3) the quality-control and consistency is extremely high from string to string, 4) they are much more affordable than the competitors, and 5) Made in USA. Also, Strings by Mail does a tremendous job in calculating the right string gauge for any custom tunings you might have, so we send all our customers to SBM!!!