10 original Dr.pen M8 cartridges with 16 pins, each cartridge is individually packaged, best diameter of 0.18 mm These cartridges are specially designed for the Dr.Pen Ultima M8 and are compatible with the Dr.Pen M7S and Angel Kiss M8 Pro. They are not compatible with other models or brands Dr Pen Ultima M8 cartridges have been developed according to the highest US standards and guarantee 100% originality Use a new one each time and for personal use only, do not share with others Most important: remove the white plastic protective cover from the tip of the cartridge before turning on the pen