This Tariff Concession Order applies Schedule 4 Item 50 of the Customs Tariff Act 1995 to multiple‑ply, combed, waxed, ring‑spun knitting yarns (tariff heading 5206.31.90) that are at least 50% cotton and no more than 50% polyester, effective 30 May 2006. Mechanically, importers of those yarns receive the tariff treatment Item 50 provides while the order remains in force. It affects importers and traders (who claim the concession) and the customs agency (which may revoke the order under sections 269SC/269SD); importers must classify and document composition to rely on it.