100% AUTHENTIC: Well-made M8 replacements cartridges are produced by Dr.pen Original factory. Thirty-six pin type cartridges are specially designed for Dr.pen M8 & M7S, and Angel Kiss M8 Pro derma pen, ensuring genuine quality and compatibility. Ultra-Fine Precision Cartridges: Dr. Pen Ultima M8 cartridges, with a 0.2mm ultra-fine diameter, are crafted for versatile face and body use, enhancing your skincare routine. SUITABLE FOR FACE BODY BEARD SCALP HAIR: Smooth and arch-shape bottom allows users to move the cartridge on the skin easily. It can be used on a tiny area of face, such as the area around nose, lips etc. SAFE & CLEAN - Each cartridge is individually packed, is clean and safe for users. Use a new one each time and only for the personal use, don't reuse, share with others. IMPORTANT NOTE: Remove the white plastic sanitary cover from the top of the cartridge before turn on the pen. THEY ARE NOT COMPATIBLE WITH OTHER MODELS, OR OTHER BRANDS.