It's easy to mistake 4b for 4a. Like the other poster explained she saw coils in her hair and assumed she was 4a. But her coils can't be seen from a distance which makes her a 4b. The only difference between 4a and 4b is that 4a coils can be seen from a distance. 4b has coils but they are so small it looks like a cottony cloud. But close up you can see the coils.