This is what NC says on type 4 hair -
Type 4 is kinky, or very tightly curled, with a clearly visible curl pattern
• Circumference: Crochet needle or even smaller
I always thought that coffee stirrer or pen spring size was 4a, I believe that is the original definition.
I agree with Nappy*Me and the others who say there is no such thing as 4c hair. The picture of her hair is exactly what I think of when I think of 4b hair.
BUT - I think this thread once again proves why the hair typing system is erroneous, because there are always going to be outliers, and if it's a "true" system, people can't just make up additional hair types because they don't feel as if they belong in any of the categories. Also, since hair typing doesn't take texture into consideration, a lot of people don't realize that your hair can look VERY different due to texture, but you will still fall into the same category as someone else.