This Tariff Concession Order declares a specific polyoxymethylene copolymer (tariff heading 3907.10.00) with stated tensile, density and melt-flow specifications (±5% tolerance) to be covered by Schedule 4, item 50 of the Customs Tariff Act, effective 23 April 2007 until revoked. Importers of resin meeting the written specification obtain the tariff concession; the concession is granted and can be revoked by a delegate of the Chief Executive Officer. The instrument changes import cost incentives and requires technical verification at customs clearance.