Bulk hair is loose unwefted hair that is commonly used for braiding or to create unique hiar extension styles. It will be also called Single Drawn Bulk Hair. The hair that comes from one single donor(person). Hair running down her back is going to be longer than hair in the front and middle of her hair, this is normal with human hair. This is why you will get some hairs that are shorter than others; once again this is normal with human hair.