Section 13 Articles of stone, plaster,cement,asbestos, mica or similar materials; ceramic products; glass and glassware 70 Glass and glassware 70 02 Glass in balls, rods or tubes, unworked Commodity Code Description 70 02 10 Balls 70 02 20 Rods 70 02 31 Tubes of fused quartz or other fused silica, unworked 70 02 32 Tubes of other glass with a lce =<5x10-6/k, unworked 70 02 39 Tubes of glass, unworked, nes