Perfect for after-dinner espresso or coffee, these hand-blown mugs feature a double layer of strong but lightweight borosilicate glass that acts as an insulator. The heatproof glass stays pleasantly warm to the touch when serving hot beverages, so it is easy to hold very hot coffee drinks. The glass also produces a striking optical effect, with the contents appearing to float within the double walls. In addition, borosilicate glass is dishwasher safe and will not become cloudy over time. The 5-oz. mug is ideally sized for espresso; the 10-oz. size serves coffee, tea, hot chocolate, mulled cider or other hot drinks. Microwavable; oven, freezer and dishwasher safe. Not intended for use with metal spoons. 5-oz. cap. is 3 1/4" high; 10-oz. cap. is 4 1/4" high. Made in China. Set of two.