Section 13 Articles of stone, plaster,cement,asbestos, mica or similar materials; ceramic products; glass and glassware 70 Glass and glassware 70 11 Glass envelopes (including bulbs and tubes), open, and glass parts thereof, without f 70 11 10 Open glass envelopes (incl. bulbs and tubes), for electric lighting Commodity Code Description 70 11 10 00 Open glass envelopes (incl. bulbs and tubes), for electric lighting 70 11 10 10 Stems 70 11 10 90 Other