I purchased these from the official Natural Kitchen online store, but I'm selling them because the size was different than I expected. Set of 8. These "tumbler-type" double-walled glasses can be used for a wide variety of purposes and are designed to prevent condensation. While they are not microwave-safe, they are also recommended for hot beverages. Material: Glass (borosilicate glass) Product Size: W 6 x D 6 x H 6.5 cm Capacity: 80ml Handling Precautions: Not microwave-safe / Not oven-safe / Not dishwasher-safe Cold/Heat Resistance: -20°C to 120°C Country of Origin: China - Brand: NATURAL KITCHEN - Material: Glass - Shape: Round - Use: For beverages Thank you for looking.