Every perfectly shaped glass from Riedel is designed around the exceptional characteristics of each grape variety, which in turn determines the shape, size & rim diameter of the bowl. The “O” Riesling/Chianti wine tumblers are innovative, wonderful for Riesling or Chianti wines and a relaxed variation on the more classic wine glass. These are perfect for picnics and everyday use- broken stems are a thing of the past. Riedel, after four decades of designing & fine tuning, are the only glassmakers who put so much passion into developing the finest tools to capture the wines' full potential. Riedel glasses are a pleasure to drink from and are famous for changing the quality of your wine drinking experience.