Section 13 Articles of stone, plaster,cement,asbestos, mica or similar materials; ceramic products; glass and glassware 68 Articles of stone, plaster, cement, asbestos, mica or similar materials 68 01 Setts, curbstones and flagstones, of natural stone (except slate) 68 01 00 Setts,curbstones and flagstones,of natural stone (except slate). Commodity Code Description 68 01 00 00 Setts,curbstones and flagstones,of natural stone (except slate).