15As a preliminary point, it should be borne in mind that, when the Court is requested to give a preliminary ruling on a matter of tariff classification, its task is to provide the national court with guidance on the criteria which will enable the latter to classify the products at issue correctly in the CN, rather than to effect that classification itself, in particular since the Court does not necessarily have available to it all the information which is essential in that regard. In any event, the national court is in a better position to do so (Joined Cases C-260/00 to C-263/00Lohmann and Medi Bayreuth [2002] ECR I-10045, paragraph 26, and Case C-500/04Proxxon [2006] ECR I-1545, paragraph 23). However, in order to give the national court a useful answer, the Court may, in a spirit of cooperation with national courts, provide it with all the guidance that it deems necessary (see, in particular, Case C-49/07MOTOE [2008] ECR I-4863, paragraph 30).