I'd always thought I was 4b but having looked at mnay albums and some youtube videos, people who I would consider 4a are calling themselves 4b, and I'm NO where near their texture. So with that I bumped myself now to having more 4c and some 4b texture.
I figure I can't go wrong with identifying with 4b/4c, because (in the past) I made the mistake of following hair regimens posted by people who said they were 4b, but I would consider 4a by looking at their hair...it always failed me.

My sister yesterday discovered a whole new class..she's calling herself a 5. lol