This is a great value tool for my anti-aging regimen. I have sensitive skin due to tretinoin treatments, however, I still desire to dermaroll for additional anti-aging benefits and skin tightening. This length is great for sensitive skin as well as for better product/serum penetration. I’m not red after use and the roller seems quality. I do get better absorption of my skin serums after use because the next morning my face glows and seems more refreshed & firm.