Dr.pen Ultima M8 Replacement Cartridge Needles Dr.pen Ultima M8 Replacement Cartridge Needles Needles Quantity:10pcs Compatiable with Dr.pen Ultima M8 Needle Type:11/16/24/36/42/Nano It is an eletronic automated micro needle,with guides that adjusts needles length. It is hygienic,convenient,and safe. Advantage: 1.The diameter of dr pen cartridge is 0.18mm, less painful.Minimised epidermal damage 2. Less pain and erythema as high speed with vertical direction 3. More easy to operate at the small or curved areas 4. Disposable needles 5. More quickly and efficient than manual Micro-needle 6. The treatment effect is obvious . Short healing time. 7. No bruising, infection, discoloration or other complications. 8. Extremely high absorption of any active ingredients. 9. Almost all skin types can be treated.