The abrasive coating of Dr.Alex files is made of silicon carbide. The tiny crystals of this ultra-hard material have a black-blue color and sharp edges, allowing you to easily and quickly shape the nail plate as desired. A special stearate coating provides an antistatic effect and prevents the abrasive from clogging. Dr.Alex files are easy to wash and sanitize. Designed in a popular oval shape, they allow for precise correction and shaping of the nail plate along its entire length.