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HIGHEST QUALITY 540 NEEDLES: We at Mars By GHC use only titanium alloy needles to produce our highly effective, gentle derma roller 0.5mm which is the perfect solution for maximizing results. The derma roller for Hair comes with 540 titanium alloy needles of diameter 0.5 mm which is the perfect solution for maximizing results. COLLAGEN PRODUCTION: 0.5 mm derma roller will also stimulate natural collagen production, keratin production, and activate skin-cells growth factors.