This Riedel glass series has something missing; there is no stem or base. Riedel 'O' is the innovative take on the wine tumbler, the designs of which are based on the benchmark shapes of the Riedel Vinum. These are the ideal glasses for every day use and for every occasion; they are fun and feel good to hold. The 'O' series is a lead free machine blown series, and is dishwasher safe. The 'O' Riesling/Sauvignon Blanc tumbler is ideally suited to showcase the best characteristics of light to medium bodied white wines such as Riesling, Sauvignon Blanc, White Bordeaux, Gewurztraminer and Semillon.