The handy machine-made cognac glass of the space-saving glass collection O Wine Tumbler attracts attention through its stemless design. This makes it less susceptible to glass breakage and easy to put into the dishwasher. A sip of this glass of a cognac is a truly outstanding tasting experience: fruit, body, finesse and fire. O is the ideal glass for everyday use and for every occasion. It is fun, feels good to hold, looks trendy and it works! All RIEDEL glasses are dishwasher safe.