This Order declares a narrowly described class of offshore riser trusses (specific minimum height, subsea depth, weight, cathodic protection to DNV‑RP‑B401 and incorporated riser pipes) classified at tariff heading 7308.90.00 to be subject to Item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995. It operates from 21 April 2009 until revoked under sections 269SC or 269SD of the Customs Act 1901. Importers of these trusses are affected because the Order changes their tariff treatment, altering import costs and commercial incentives; the declaration was made by a CEO delegate (Paul Mercer).