Declares that square copper–nickel tubes that conform to ASTM B111 C70600 and do not exceed 100 mm × 100 mm × 6 mm are goods to which Item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995 applies, effective 20 November 2008 until revoked. This determines the tariff treatment applicable to those specific imported goods (tariff classification 7411.22.00) and affects importers, customs officers and suppliers; revocation and administrative decisions are governed under sections 269P, 269SC and 269SD of the Customs Act 1901.