This set contains four tumbler glasses, specifically designed to enhance the flavour and enjoyment of gin and tonic. The handy machine-made gin set 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. 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.