| The 77's are flatwounds. The 66's are quite the opposite of flats - I believe they're stainless (the set I have) and are very bright and tingy, but actually the best tone for the Geddy bass IMO and I currently have them strung on her.
As for the Roto 77's, they're kicka$$ sounding flats when I first put them on. Be ready for really really dark tone. Very awesome vintage style.
The bad part is they started to bow my neck, even a few months after a setup when I had them strung for the first time. I read they're rated as higher-tension strings.
If I decide to put flats on again, I'll try the D'Addario Chromes, I've heard great things about them.
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