Paving in double-layer compressed vibrated concrete slabs CE marked, produced and controlled according to EN 1338, patented model of rectangular shape with dimensions 12.5 x 25 cm, thickness 8 cm, finish series DRENANTI (double layer). The paving slabs must have a draining capacity of approximately 5% (480 l/min m2) for "running" laying and 9% (633 l/min m2) for "herringbone" laying suitable for filling with gravel 2/6 mm (according to UNI EN 13242). The special double-layer finish is made with selected aggregates that guarantee abrasion resistance, durability and long-lasting colouring. The paving slabs, produced with natural (non-recycled) aggregates and non-organic oxides, have a homogeneous and colourful finishing layer and a sharp-edged visible surface without chamfers.