CPV code 44172000 designates Sheets (construction) in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
44172000 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 44170000 (Plates, sheets, strip and foil related to construction materials).