Chromium needles with titanium finish: Our Derma Roller has 540 (0.5 mm) chromium microneedles with a titanium finish to give you a premium vibe and an unmatched experience. The needles create micro-punctures on your scalp & beard, boosting hair growth and health. Safe, easy & effective: The Roller is an easy to use handheld tool which is safe and effective. Make sure you apply gentle pressure and use it regularly to witness great results over time.