Includes two dual wall glasses 85ml (3oz.) capacity provides portion control, and can be used for serving single-shot of espressos and other small-portion drinks Dual Wall design retains the temperature of beverages for long by keeping hot drinks hot and cold drinks cold Patented air silicone valve maintains optimal air pressure to minimize condensation Borosilicate heat resistant glass maintains its excellent transparency level, even after many uses Safe to use in dishwasher, microwave, freezer, and oven