Section 13 ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIAL S; CERAMIC PRODUCTS; GLASS AND GLASSWARE 68 Articles of stone, plaster, cement, asbestos, mica or similar materials 68 10 Articles of cement, of concrete or of artificial stone, whether or not reinforce 68 10 91 68 10 91 00 Commodity Code Description 68 10 91 00 00 -- Prefabricated structural components for building or civil engineering