A unique perfect skincare tool to achieve long-lasting results Creates tiny channels in skin, allowing the active ingredients in skincare products to most effectively penetrate skin 1.0 mm dermaroller works best on deep indentation acne scars, stretch marks, large pores, hyperpigmentation, hair growth & wrinkles Can be used once a month or twice a month once your skin can tolerate weekly treatment Comes in a sealed package & is made of medical-grade steel