Derma Pen M8 Needle Cartridges. Features: It is an Eletronic Automated Micro Needle,with Guides That Adjusts Needles Length. It is Hygienic,convenient,and Safe. 1.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  7. Short Healing Time.  8. No Permanent Damage or Injury.  9. No Bruising, Infection, Discoloration or Other Complications.  10. Extremely High Absorption of Any Active Ingredients. 11. Almost All Skin Types Can Be Treated.  12. Thickens the Dermis Without Damaging or Removing Epidermis. SPECIFICATIONS Microneedle Length: 0.25mm Material: Plastic Power Source: None Electric Needle Type:11/16/24/36/42/Nano/5D/3D Quantity of Needles: 10 Pcs Needles . We are an international seller, your order will be shipped from abroad so please allow the necessary time of minimum 14 working days for delivery right now depending on where you ship to, due to ongoing delays in postal deliveries globally.