... & PSE certificate3.auto derma roller 4. 1 year warranty5. skin care Derma roller,Skin Needle Roller,micro needle roller,beauty roller ... collagen fiber growth,2.Improve micro-circulation ,3.Enhance skin care product's activity substances into deeper skin layers,4.Treatment ... rolling on the places which need to cure,accompanying with functional nutrition liquid.It can puncture more than 250,000 micro ...