A handheld device called a "Kostech derma roller" is used to increase the absorption of topical applicators for better nourishing of the skin and hair. It has 540 titanium alloy microneedles. Derma Rollers 540 Titanium Needles that puncture the surface of the skin and create microscopic injuries. Decreases stretch marks and cellulite; removes very deep wrinkles, hyperpigmentation, and acne scars The micro-needles pierce just deeply enough to improve circulation and trigger cell regeneration. Derma rollers can help stimulate collagen production, which is important for skin elasticity and firmness. Derma rollers can help improve product absorption, making your skincare products work more efficiently