The description of the item 7410210055 of Italy HScode: "Refined copper foil, backed, of a thickness ""excl. any backing"" of <= 0,15 mm (excl. stamping foils of heading 3212, metal yarns and metallised yarns and foil made up as christmas tree decorating material) : Plates: consisting of at least one layer of fibreglass fabric impregnated with epoxide resin, covered on one or both sides with copper foil with a thickness of not more than 0,15 mm, with a dielectric constant (DK) of less than 5,4 at 1 MHz, as measured according to IPC-TM-650 2.5.5.2, with a loss tangent of less than 0,035 at 1 MHz, as measured according to IPC-TM-650 2.5.5.2, with a comparative tracking index (CTI) of 600 or more"