Micro Needle Roller System (0.5mm) promotes smoother, firmer healthier skin. The Microneedle Roller uses 540 extremely fine needles to stimulate collagen and elastin production. The micro channels that result from the needle action help in increasing the absorption of serums and topical creams that are used in one s daily routine. As a result of the greater skin penetration, there is a significant overall increase in the efficacy of daily skin care products.