Grow you hair faster with Dushi derma roller and Dushi Rapid Hair Growth Serum. Dushi advanced anti-slip derma roller has been designed to penetrate the hair follicles at the root to stimulate hair growth and prevent hair loss. Made with 540 medical grade stainless steel needles with cross-line arrangement that roll painlessly over the scalp. These needles create “micro-punctures” in the superficial layers of the scalp and follicles triggering the body’s natural repair process, encouraging new hair growth. This process also improves the absorption and efficacy of solutions like Dushi Rapid Hair Growth Serum.