For 250 years, Riedel has been manufacturing glasses in Bavaria (Germany). The O collection presents stemless glasses perfect for any occasion. They are made according to the traditions of the Vinum collection and are designed to offer the best possible taste and smell experience. All Riedel glasses are dishwasher safe. Riedel glasses have a life span of approximately 1500 washes in a dishwasher, the equivalent of 20 years. To avoid scratches, make sure that the glasses are not in contact with other glasses or metal objects in the dishwasher or in the cupboard. If possible, use a glass rack. To avoid stains, use soft water with a low mineral content. To remove stains, use a little vinegar. When washing by hand, use hot water with detergent and rinse the glass gently. Avoid storing glasses in cabinets near strong smelling foods. This could alter and tint the glass or even affect the aroma of the wines. 3.875 " or 9.84 cm high.