My shortest hairs at the the very back of my neck. These pieces dont' curl vey well, but they seem to be getting "better" as I grow my hair out. The same thing happened with my short layers by my face. They are now long enough to curl into nice ringlets. :-) This makes me think I am more 3A than 2B, because my hair definitely seems to get curlier (more ringlets) as it gets longer, almost like the hair needs "room" to curl.
HTH
Former CG then modified CG, now too lazy :P Type 2B/3A (I think...) and still rather annoyed with my hair :P