This Tariff Concession Order, signed under section 269P of the Customs Act 1901, declares that a specific ‘chain track system’ (classified at 8477.80.00) for polypropylene film expander machines is a good to which Item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995 applies. It took effect on 12 August 2011 and continues until revoked under sections 269SC or 269SD or until any date specified in the Order. Practically, it changes the tariff treatment at import for those particular machine components and thus matters to importers and customs authorities.