Description: 1.Cartridges made of steel needle and PC plastic, ech one sterilized packages before leaving the original factory. 2.Easy to use, durable and quick-acting, high absorption of active ingredients, no permanent damage or injury. 3. Multifunctional - With many different Dr. pen cartridges and many different uses, please choose the cartridge that suits you. 4.Package includes5 PCS Nano Needles Replacement Cartridges for Dr Pen A6 5.Only for the personal use, don't share with others in order to avoid infection. 6.Application: Just replace the needle. Needle length is adjustable to different sizes depend on the areas and purposes of the treatment. It is more convenient to treat narrow area such as nose, around eye or mouth. 7.It is an eletronic automated micro needle,with guides that adjusts needles length. 8.It is hygienic,convenient,and safe.The perpendicular movement of the needle tip enables treatment of narrow areas, and lessen the pain. Specification: How to Use? Step 1. Sterilize the cartridges before and after each use (75% alcohol, or sterilized with physiological saline, or UV), wash and dry the skin. Step 2. Move in the desired area for 2-4 times, , roll every part in the shape of CROSS and X, the operation need to last 8-15mins. Package Includes: 5x Needle Cartridge Tips