... Portable Microneedle Derma RollerI. Theory of Microneedle therapy Microneedle therapy uses a knead rod inlayed with 192 slender steel Needles, ... be used to beauty, body slimming, hair regeneration, and effectively for skin anti-aging.II. Production Specifications* Roller Body: diameter ... of ruined skin1.5, 2.0, 2.5mm ( Use for solutions of thick wrinkle, large pore, injury scar, pimple scar ...