Environ Skin Tech+ Micro-Needling Cosmetic Roll CIT108 needles 0. 1 mm The principle of the Cosmetic Roll Cit is that the micro needles puncture the horny layer of the epidermis, which is the main obstruction to penetration of active ingredients. Once this layer has been breached, the active ingredients in the skin care products can reach into the depths of the skin about 10,000 times more effectively than by simply applying the products topically. Use of the Cosmetic ROLL CIT will give the appearance