100% AUTHENTIC - Well-made M8 replacements are produced by Dr.pen. These type cartridges are specially designed for M8 device. SAFE & CLEAN - Each cartridge, wrapped singly, is clean and safe for users. DISPOSABLE - To reduce the risk of cross-infection, all cartridges for Dr.pen microneelding device are disposable. WELL-MADE & ULTRI-FINE - As the 16-pin cartridges are well-made and ultra-fine, they effectively cause less pain and damage which also speed up the recovery process. SUITABLE FOR FACE HAIR & BODY TREATMENT - 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.