The Cabernet glass is perfect for full-bodied, complex red wines with high tannin content. The generous dimensions of this glass allow the bouquet to fully unfold and smooth out rough notes. It emphasizes the fruit, downplays the bitterness of the tannin, and enables the wines to achieve a good balance. The Riedel O Tumbler was designed in 2004 and was the first varietal-specific wine glass without a stem in history. O is an innovative interpretation of the casual wine glass, based on the bowl shapes of Riedel's Vinum series. Even better: The O Tumbler is dishwasher safe, making broken stems a thing of the past.