The needles punch through the epidermis, allowing ink to seep deep into the dermis, which is composed of collagen fibers, nerves, glands, blood vessels and more.
As agulhas perfuram a epiderme, permitindo que a tinta  se introduza na derme, que é formada por fibras de colagénio, nervos, glândulas,  vasos sanguíneos e outras coisas.