Section 07 Plastics and articles thereof; rubber and articles thereof 40 Rubber and articles thereof 40 01 Natural rubber, balata, gutta-percha, guayule, chicle and similar natural gums, in primary forms or in plates, sheets or strip. 40 01 21 Smoked sheets 40 01 21 00 Smoked sheets Commodity Code Description 40 01 21 00 000 Smoked sheets