(1) Hair is shiny, elastic and tough, and it is not easy to break.
(2) The hair is clean and tidy, without dandruff and dandruff.
(3) It is neither thick nor hard, and it is not split or knotted. The hair is soft and easy to comb, and there is no electrostatic reaction when combing.
(4) When touching by hand, there is a sense of lubrication.
(5) Not affected by the outside world. If some of them are sunburned, scalded and dyed, they will not change.
(6) The density is moderate, especially the hair roots should be symmetrical.
(7) No mixed colors such as variegated color, yellow color and brown color, uniform color, and no dichroism in hair shaft and hair tail.