They are slate, a natural material , which is processed to facilitate easy fitting.
Their thickness is 1 to 3 cm. with embossed appearance, thus allowing for a more natural result .
Fitting is done via common joint or adhesive, in rows or a knitted pattern. They are used for cladding surfaces on walls, fireplaces, kitchens, etc. indoors or outdoors and come in many colours like brown , gray , green and shades thereof.