* Microneedle therapy * Derma Roller Size:0.2mm, 0.25mm, 0.3mm, 0.5mm, 0. ... Portable Microneedle Derma RollerI. Theory of Microneedle therapy Microneedle therapy uses a knead rod inlayed with 192 slender steel Needles, accompanying with ... anti-aging.II. Production Specifications* Roller Body: diameter 20mm X width 14mm* Disc: 8 Microneedle Discs* Needles Disc: 24ea ( total needle: 192 ...