Heading 7411
Copper tubes and pipes
741110
Copper; tubes and pipes, of refined copper
741121
Copper; tubes and pipes, of copper-zinc base alloys (brass)
741122
Copper; tubes and pipes, of copper-nickel base alloys (cupro-nickel) or copper-nickel-zinc base alloys (nickel silver)
741129
Copper; tubes and pipes, of copper alloys (other than copper-zinc, copper-nickel base alloys (cupro-nickel) or copper-nickel-zinc base alloys (nickel-silver))