The physical properties of this kind of tile is the same as single layer, and it is in an octagonal form. Naturally, the gap between each four tiles should be fill by a 0.10×0.10 tile (which is better to use a different color)
Usage items:  Internal spaces, airport and bank buildings, supermarkets, hotels and also they can be used as coverage for old levels.
Size:  0.40×0.40             
Certificates:  “standard 755 Iran” and technical certificate from “Urban Development and Housing research center”