I haven't figured out how to introduce it yet, probably... anyway... well... it's used on the head, with hair growth fluid, you can choose various brands of hair growth fluid on the market, open the lid and add a proper amount of liquid, then put it on the head, massage the scalp, the added hair growth fluid will rub and exude with the action of combing the hair, making the hair growth fluid better absorbed. Appearance and other have been patented, the product has been mass-produced, please do not try the law. Part of the typesetting method is imitation, if you offend, contact me to delete.