Double-walled: No risk of burning your fingers with hot drinks - and no condensation forms on the glass surface with cold drinks. Important: Hand washing is recommended. Borosilicate glass: By using high-quality borosilicate glass, the mug will not burst even at high temperatures. It is possible to fill hot water into the ice-cold mug. Hand-blown workmanship: Thanks to the high-quality workmanship and the experience of the glassblowers, the glass is wonderfully light, clear and smooth for easy and pleasant use. Capacity: The capacity until full to the brim is 400 ml (recommended usage capacity 350ml). Due to the hand-blown craftsmanship, the capacity of each cup varies from 5% to 10%. A perfect choice for coffee, tea, desserts and more. What you get: Two 400ml double-walled glass mugs