10/50/100PCS Derma Pen Bayonet Needles Cartridge For Dr pen N2/M5/M7 Nano/9 pin/12 pin/36 pin/42 Micro Needle Replacement Head

application: Just change the needle. The length of the needle can be adjusted to different sizes depending on the area. It is more convenient to treat narrow areas such as the nose, around the eyes or in the mouth. feature: Item: for N2 M5  M7  E30 needle Needle type: 9/12/24/36/42/nano/5D/3D/nanosilicone Number of stitches: 10 / 50 stitches, excluding box and machine. It is an electronic automatic microneedle with guide rails that can adjust the needle length. It is hygienic, comfortable and safe. The Dr pen M7 features a unique curved edge refill for a better fit and smoother finish. These replacement cartridge needles are for Dr pen M7 only benefit: 1. Minimize epidermal damage 2. Less pain and less erythema at high speed in the vertical direction. 3. Easier to operate in small or curved areas 4. Disposable needles 5. Faster and more efficient than manual microneedling 6, the treatment effect is obvious 7. Short curing time. 8. No permanent damage or injury. 9. No bruising, infection, discoloration or other complications. 10. The absorption rate of any active ingredient is extremely high. 11. Almost all skin types can be treated. 12. Thickens the dermis without damaging or removing the epidermis.