Each cartridge is individually packed, finest diameter 0.2mm, bayonet slot.
These replacement cartridges are specially designed for Dr. Pen Ultima M8, they are not compatible with other models, or other brands. Please note that these cartridges are specially designed for Dr Pen Ultima M8 Microneedling pen, they are not compatible with Dr Pen M8S and Dr Pen A9/ M5 / M7 / N2.
Use a new one each time and only for personal use, don't share with others.
Important Note: Remove the white plastic sanitary cover from the top of the cartridge before turning on the pen.