This set contains 4 pieces. In 2017 Riedel expanded the existing collection by four more colors: azure-blue, Violet, cinnabar Red and orange. The handy machine-made soft drink glass of the space-saving glass collection O wine tumbler spreads a good mood With its steamless design and the colorful base. The innovative design 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.