The physical characteristics of this kind of tile is same as those of industrial stone and its surface is like washed beton tiles. 
Usage items:   Internal spaces such as halls of airport, school halls, parking, hospitals, factories, libraries, and external spaces such as landscaping and sidewalks.
Size:  0.52×0.52; 0.50×0.50               
Certificates:  “standard 755 Iran” and technical certificate from “Urban Development and Housing research center”