Declares that specific goods — self‑adhesive polyisobutylene sheets with aluminium‑mesh inserts (tariff classification 3919.90.00) — are covered by Item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995. It takes effect from 23 March 2009 and remains in force until revoked under sections 269SC or 269SD. The decision, signed by a delegate of the Chief Executive Officer, changes the legal tariff treatment of those goods and therefore affects parties importing or supplying them; revocation is at the administering authority's discretion.