Section 13 ARTICLES OF STONE, PLASTER,CEMENT,ASBESTOS, MICA OR SIMILAR MATERIALS; CERAMIC PRODUCTS; GLASS AND GLASSWARE 70 GLASS AND GLASSWARE 70 18 GLASS MICROSPHERES NOT EXCEEDING 1 MM IN DIAMETER. 70 18 20 GLASS MICROSPHERES NOT EXCEEDING 1 MM IN DIAMETER Commodity Code Description 70 18 20 00 GLASS MICROSPHERES NOT EXCEEDING 1 MM IN DIAMETER