141As regards the applicant’s claim that physical differences can justify making a distinction between products only when they matter to consumers, that claim has no basis either in the basic regulation or in the case-law. As is apparent from paragraph 138 above, the European Union institutions may take account of a number of factors when defining the product concerned, among which the physical, technical and chemical characteristics of the products are naturally important, but without necessarily having priority. In any event, it cannot be considered that the differences in the physical or technical characteristics are relevant only when they are reflected in consumer perception.