Signal your brain to start producing more collagen. As we know, collagen is the building block of skin. The Zoë Ayla Micro-Needling Applicator Derma Roller, with micro-needles for the face, removes in modo painless and delicate the upper layer of the skin thanks to the 0.5 long needles mm. The resulting micro-wound sends a signal to the brain to repair the damaged area and create new collagen.