Tubes and pipes of coppernickel base alloys "cupronickel" or coppernickelzinc base alloys "nickel silver"
Tubes and pipes of copperzinc base alloys "brass"
Tubes and pipes of copper alloys (excl. copperzinc base alloys "brass", coppernickel base alloys "cupronickel" and coppernickelzinc base alloys "nickel silver")