From the picture, hair shaft is the part of hair that can be seen above your scalp. It’s made of a protein called keratin, compacted and cemented together. Hair shaft consists of three layers:the cuticle, the cortex and the medulla. A hair shaft of thick hair which cuticle is open and have a thin medulla in the middle of hair. From the lower picture show the appearance of the hair bulb look like not strong because hair bulb is a tiny.