The disposable medical microneedle has the effect of micro-trauma, high repair, activating cells, promoting collagen fiber and elastic fiber proliferation, smoothing depressed scars, and promoting local blood circulation, which makes the skin regenerate from the inside out and increases the strength of skin's resistance. The roller needle acting on the scalp area, is capable of promoting blood circulation, accelerating the regeneration of hair follicles, and at the same time can open the skin absorption channels, and accelerate the absorption of nutrients, with double effect, hair growth and prevention of hair loss with half the effort. Sterilized single-use roller needles are mainly used with handles and syringes (two different models) and can be interchanged with a single twist to suit different situations. The roller needle is used not only for general skin problems, but also for stretch marks, fat marks and deep sinking marks. It also stimulates hair growth to a certain extent by…