O (2004) is the first varietal specific wine tumbler in history. O is an innovative take on the casual wine glass, giving total wine enjoyment. O is based on the benchmark shapes of Riedel Vinum to enhance the world’s most important grape varietals. The tumbler, used for centuries as an all-round drinking vessel, is now turned into a sophisticated wine accessory. It is stackable for easy storage and fits into every dishwasher. Broken stems are a thing of the past. O is executed in crystal (lead-free), machine-blown in Bavaria, Germany.