... 1.5mm, 2.0mm, 2.5mm, 3.0mm Portable Microneedle Derma RollerI. Theory of Microneedle therapy Microneedle therapy uses a knead ... 192 slender steel Needles, accompanying with functional nutrition liquid, regularly rolling in the places which need to cure. It can puncture ... the epidermal within ifve mins, from a eeficient nutrient delivery system in the epidermis and subcutaneous, with which the active ...