Replacement Needle Cartridges Fit For A6 Dr.Pen Derma Pen Electric Auto Microneedle Therapy System. We are very appreciated you can double check before purchase.The Dr.pen derma pen adopts the newest technology so you can control the speed of vibration and the needle length. This allows you to reach maximum results in all areas of the skin.Needle Main Function: ❤12 pin needle: repair acne pox pit; remove acne; eliminate stretch marks, wrinkles. ❤36 pin needle: whitening; watering; spot removing; shrink pores. ❤42 pin needle: painless nutrition importing, whitening skin; spot removing; skin rejuvenation. ❤Nano needle: painless nutrition importing; whitening skin; spot removing; eyelash and eyebrow grow. ❤Experts recommend to use Derma Pen Microneedle with topical numbing cream and Vitamin C serum together. Features: ❤ Adjustable length of micro-needles (0.25~2.5mm) ❤ Hygienic, convenient, and safe. ❤The needle tip enables treatment of narrow areas, and lessen the pain. ❤Skin Care Attribute: Lighten color spot relief dark sore pore. ❤Thinning nutrition input decrease slender line cell regeneration relief stretch marks complexion improvement. ❤Needle quantity: 10pcs 36 pin needles (The derma pen was not included) ⚠NOTE: ⚠These replacement dr.pen ultima a6 needles need to disinfected(by 75% alcohol or physiological saline or uv) before use, and need sterilized nursing parts by physiological saline. ⚠It's better to change the cartridges frequently and not to use it consistently, it may cause infection. ⚠Use a new one each time, don't reuse.