4 in 1 derma roller set for skin care - it is a device that is rolled over the skin and has needles for puncturing. After the rolling process, cells begin to appear again as well as collagen. Its benefits: stimulates collagen production - improves skin elasticity - reduces pore size - smooths acne scars - reduces fine lines and wrinkles and dark circles - reduces wrinkles and rejuvenates the face - consists of 3 separate heads to meet your skin needs: head suitable for body 1.5 mm size: composed of 1200 needles: helps you reduce signs of skin sagging, stretch marks and scars. - Head suitable for face 1.0 mm size: composed of 720 needles: helps reduce signs of skin aging. - Head suitable for sensitive facial areas such as lips and eyelids composed of 300 needles 0.5 mm size.