The decorated, machine-made tumbler of the stylish, yet subtly nostalgic glass collection RIEDEL Barware are inspired by the glamorous Art Nouveau period and present a contrast to Riedels purist, unadorned wine glasses. Optical O is based on the popular O series of stemless wine glasses and was designed by Maximilian J. Riedel. With two different sizes, these glasses are perfect for cocktails, mixed drinks and soft drinks alike. RIEDELs Barware tumbler collection presents perfect, must have glasses for all cocktail and spirits lovers. All RIEDEL glasses are dishwasher safe.