About this item [Suit for Bayonet Pen] Bayonet Slot, Bayonet cartridges port are suitable for derme pen M5/M7/N2/MYM; [Round nano Cartridges] Multi function,5pcs 0.1mm round nano needle,fit for leading water and daily care of skin; [Disposable] Use a new one each time, don’t reuse; [Safe Design] These cartridges are individually sealed and packaged for optimal safety and comfort; [Original quality] Original factory quality ensurence.