Micro Needle Roller Set uses rollers covered in tiny titanium needles to pierce the outer layer of skin to send a wound signal to the brain from this area and finally induce the production of collagen in the skin. When the dermaroller is applied to the skin, micro-needles open dermise micro-channels on the skin. These channels can be thought of as submerged gates. You can use a serum, vitamins or creams(or some similar "priming" product) with a derma-roller. It acts as a buffer between the needles and your skin. The micro-channels even increase skin and hair care products diffusion in skin by 2 times.