The Riedel Stemless O Wine Glasses are the newest revolution in glassware. Casual yet elegant, these wine glasses are appropriate for fine wine enjoyment, as well as casual sipping. The wine tumblers were shaped to fit into a dishwasher and fine-tuned to enhance the pleasure of your favorite wine varietals. In keeping with the Riedel glassware tradition, these wine glasses have become the benchmark for stemless glassware. The glasses are machine made in Germany of lead-free crystal. Dishwasher Safe.