This Order attaches item 50 of Part III of Schedule 4 to the Customs Tariff Act 1995 to a specific import class: unfired or unburned magnesia‑carbon refractory bricks and shapes (magnesia ≥70%, carbon ≥5%, bulk density ≥2.7 g/cc), effective 12 August 2008. Mechanically, it makes those imports eligible for the Schedule 4 tariff treatment. It affects importers of these refractory goods (who can claim the concession) and reduces customs revenue for the Commonwealth; the concession continues until revoked under the Customs Act 1901.