A.Treatment TheoryStainless steel derma roller uses a knead rod inlayed with numbers of needles,combining with functional nutrition liquid,regularly rolling in the places which needed to cure,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.You can use it in outdoor activities including basking,but please note anti-sunburn supplies are needed.B.Advantages of stainless steel derma roller therapy Does not destroy the structural integrity of the skinGradually remove the skin deep toxins and wasteEstablish a direct transportation between skin and beauty   productPromote the skin metabolismImprove the ability of wound healing and anti-agingNo side effect, safe and reliableSimple operation   Effect is more remarkable than the general beauty products Derma roller micro needle therapy is your best choice for beauty and skin care treatments.C. Parameters of stainless steel derma rollerProduct Name :face and body derma roller