The items in the “Concrete” collection are created by the moulding of a compound made of polyester resin and high quality natural quartz (granite), which has a white colour. QR elements present a thickness which may vary from 2 to 3 cm, depending on the product typology. The largest products are reinforced internally with two types of glass fibre, thickness 04 and 018. To give greater strength to the shape, it is also fixed with a metal rectangular section inside, 30x20, 2 mm thick. This is made of galvanised steel and it is buried in the same polyester resin and natural quartz compound.