Derma roller is a handheld device with 540 titanium alloy microneedles that are used to improve the absorption of topical applicators for improved nourishment of hair skin The microneedles penetrate just deep enough to boost your circulation Usage 1 The roller is moved across the area of the skin to be treated in a series of sequential movements 2 Press firmly but do not overdo this to avoid any unnecessary discomfort 3 One way of using a roller is to imitate the points of a compass and roll its front left right and then backward This ensures even coverage without overdoing it Skin Type All Skin Types