* Microneedle therapy * Derma Roller Size:0.2mm, 0.25mm, 0.3mm, 0.5mm, ... , 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 ...