10 pcs dr pen a6 needles cartridges microneedling machine derma pen a1 m5 m7 n2 e30 replace stamp 9 12 24 36 42 pin nano micro needle stainl

derma pen needle cartridge uses a knead rod inlayed with numbers of needles, combining with functional nutrition liquid, regularly rolling in the places which needed to cure. it can puncture more than 300,000 micro vessels on the epidermis within five minutes, forming an efficient nutrient delivery system between the epidermis and subcutaneous tissue. then the nutrition liquid can entry into skin effectively. thus the effect of skin care become more perfect. micro-needle therapy is effective, safe and reliable. it is convenient to operate the micro-needle..syi