Tito admitted, however, that there is no hard proof for this theory, and that at this point no one really knows what the true origin of the "33" may have been. Nonetheless, the tradition of the printing explanation has been sustained by the company as the wording on the labels has changed over the years, and the verbiage is carefully structured to retain a length of 33 words. The Rolling Rock nomenclature on the bottles was painted on, not paper or plastic.