That’s why it’s really best to play them if possible, they all can feel a little different from bass to bass. I have seen 70’s J’s advertised as “C” and I believe the MF is designated a medium “C” (thicker than modern “C”) it’s a signature bass and it should be roughly (.085” 1st fret and .097” at the 12th) it should feel a bit thicker. I get what you are saying about Fender nomenclatures they can be sus, but we were talking CV’s here I think they are designated “C” and “slim C”.I don't think it's all true though: I have 7 Crafted in China Classic Vibe (Squier) and Modern Player (Fender) necks: one CV 60 (rosewood) and 2x70 (maple) Precision Bass neck, a Matt Freeman neck (maple) as well as CV60 J (rosewood) and Modern Player Jazz Bass (one fingerboard and one maple) necks, and not all of these have the same "slim C" profile. That's what Fender writes everywhere but it's plain not true, at least for what I have :…
…- all my 4 maple fingerboard necks have a big/fatter neck profile (D to U)
- all my 3 rosewood fingerboard neck have a slimmer "C" neck profile…
I personally love my maple CV/MP necks BECAUSE of that bigger profile that have. And I'm not talking of nut width, because my MP Jazz Bass maple necks is 38mm at the nut and it still has a huge D/U profile that the rosewood counterparts doesn't have!![]()
It would be nice to have 1st fret-12th fret measurements for players who know thier preference but I think most players are just not that savvy or picky (nothin wrong with that) I know I won’t be carrying around calipers to measure thickness. Best to try before you buy.

