... 1.5mm, 2.0mm, 2.5mm, 3.0mm Portable Microneedle Derma RollerI. Theory of Microneedle therapy Microneedle therapy uses a knead rod inlayed ... in the epidermis and subcutaneous, with which the active ingredient of the nutrition can entry into skin effectively. Then make ... 1.5mm ( use for solutions of thin epidermis, thin wrinkle, decline of elasticity)For anti-aging& rejuvenation of ruined skin1.5, 2.0 ...