Natural surface clogs are obtained from thin, hollow floor slabs, which are sawn to further reduce their thickness to 1.5/2.5 cm. Clogs with machined surfaces, which are instead derived from blocks... 
Risers may have natural surfaces when they are made from flat and thin hollow slabs with machined surfaces, or sawn off blocks (with the exception of flat, semi-gloss surfaces obtained from hollow...
By covers we mean stone elements used with frames for the discharge of rainwater. These products are supplied with natural surfaces and the calibration of the external parts, in the desired...
These articles may have a natural surface, if obtained from quarry floor slabs of various sizes and thicknesses and machined surfaces, if sawed from blocks.
A natural surface. These natural...