[QUESTION] Rounded sibilants?

Hi there, sirs!

The other day I was trying some fancy pronunciations for a couple consonants
(some not-so-fancy ones, too), only to be surprised by that fact that both
my /s/ and my /z/ sound quite noticeably different when I round my lips when
I pronounce them.

So, is there anything like rounded /s/ or /z/? I am hoping to use this as a
phonemical distinction in some conlang. And what would be a good symbol for
them? Perhaps, z-ring and s-ring? ;-)

Cheers!

--
Hæ ástis lástethe!

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