Section 15 BASE METALS AND ARTICLES OF BASE METAL 74 COPPER AND ARTICLES THEREOF 74 07 COPPER BARS, RODS AND PROFILES. 74 07 21 BARS, RODS AND PROFILES OF COPPER-ZINC BASE ALLOYS (BRASS) Commodity Code Description 74 07 21 00 BARS, RODS AND PROFILES OF COPPER-ZINC BASE ALLOYS (BRASS)