CPV code 64121200 designates Parcel delivery services in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
64121200 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 64121000 (Multi-modal courier services).