Microneedle roller with 0.5mm microneedles. Using a microneedle roller stimulates blood flow to the surface of your skin and promotes collagen production. Microneedling evens your skin tone, makes your skin appear firmer and enhances the absorption of skin care products. It can also help to reduce wrinkles and lines as well as acne scars, for example. The microneedle roller is used as a serial treatment: For the first 2–4 times, use the roller every 2 weeks and after that, twice with a one-month interval. Then, take a two-month break. Instructions for use inside the package.