Subheading 741110: Copper; Tubes and Pipes, of Refined Copper
Subheading 741121: Copper; Tubes and Pipes, of Copper-zinc Base Alloys (Brass)
Subheading 741122: Copper; Tubes and Pipes, of Copper-nickel Base Alloys (Cupro-nickel) or … etc.
Subheading 741129: Copper; Tubes and Pipes, of Copper Alloys (other than Copper-zinc, Copper- … etc.