Copper tube in the annealed condition. 4mm is to BS EN 12449. 6mm, 8mm and 10mm are to BS 2871: Part 1: Table W, annealed (EN 1057 soft). Suitable for water and gas installations.
N.B. the diameters on this page ALWAYS refer to the outside diameter of the copper tube.
4mm x 10m Copper Tube Reviews