O is an innovative take on the casual wine glass for 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 fits into every dishwasher. Broken stems are a thing of the past. O is executed in fine crystal, machine blownin Bavaria, Germany.