[safe and easy to use] our beard roller is very easy to use. The black silk of this beard roller is not a hair. After receiving the product, it must be disinfected and cleaned before use. [general specifications of the miniature needle] genuine leather roller this product adopts one of the most commonly used designs of the needle miniature, made of medical embroidered steel, suitable for skin care and not easy to break. [size]135 x 29mm [Multi - Skincare ] this micro - needle roller for men and women can be used with creams and also helps improve the absorption of skin and beard growth products. [promotes beard growth ] microneedles create thousands of microscopic channels for hair follicles, directing healthy, nutritious blood to the treatment area and activating the body's natural healing process to produce collagen necessary for hair growth. > [Frequency of use] micro needles do not need to be used daily, usually twice a week, once a week if the skin is a little red, and once a month after 10 sessions . In addition, micro needles should be disinfected and cleaned and should not be used by people with severely allergic skin.