Rustic floor tiles are glazed tiles, which are composed of two parts: embryo body and glazed surface. Glaze is applied to the surface of the tile embryo body, and it is a kind of decorative material after high temperature and high pressure firing. Due to the deliberate grinding and irregular edges of the tile surface, the appearance of erosion over time has been created to create a sense of history and naturalness. http://www.nokanitile.com/rustic-tiles/rustic-floor-tile/