Cement, concrete or artificial stone; whether or not reinforced, articles thereof

681011 Cement, concrete or artificial stone; building blocks or bricks, whether or not reinforced 681019 Cement, concrete or artificial stone; tiles, flagstones and similar, (excluding building blocks and bricks) whether or not reinforced 681091 Cement, concrete or artificial stone; prefabricated structural components for building or civil engineering, whether or not reinforced 681099 Cement, concrete or artificial stone; articles (other than prefabricated structural components for building or civil engineering), whether or not reinforced, n.e.c. in heading no. 6810