This Tariff Concession Order (TCO 0504792) applies the Part III, Schedule 4 item numbered 50 of the Customs Tariff Act 1995 to imports classified at tariff heading 3908.10.00 — co‑polyamides of polyamide‑11 and polyamide‑12. It took effect 27 April 2005 and runs until revoked under the Customs Act 1901. Who it affects: importers of these copolyamides and Customs administrators. Why it matters: it changes the tariff treatment at import (affecting import costs and government receipts) and requires correct classification to claim the concession.