Derma Roller with Micro-Needling Technology:Supports the efficacy of hair thinning treatments and serumHelps remove dead skin cells from the scalp540 high grade, painless, 0.25 mm titanium needlesDesigned for use on entire scalp area in both men and womenFOLIGAIN\'s HAIR & SCALP ROLLER is a comprehensive scalp stimulation derma roller designed to support hair and scalp health. The sleek roller design includes 540 stable, ultra-fine titanium needles that roll painlessly over the scalp and penetrate the skin\'s upper surface. The combination of cross-line needle arrangement and ultra-fine needles ensures this process is non-invasive.