Riedel 'O' Wine Tumblers - Pair. The first range of glasses to be based exclusively on the characteristics of grape varieties. The 'O' range has something missing - there is not stem or base. Designed by Miximilian Riedel (11th generation), and based on the benchmark shape of the Vinum range, 'O' is the ideal glass for everyday use, it's easy to store and difficult to knock over! Contemporary in design, feels great in the hand, andeach glass has been finely tuned to the subtleties of each grape variety.