The Bodum 10325-10 canteen double wall cup will bring a modern & innovative change to your everyday drink-ware. The mug features walls with two hand blown layers that creates an optical illusion of the suspended liquid inside. The mug is crafted of borosilicate glass that is used to make scientific lab equipment making them exceptionally strong lightweight & thermally insulating. The two-layer construction allows the piece to retain heat & prevents condensation making the glasses remain comfortable to hold & safe for any table top.6 oz Box contains 2 mugs Dishwasher safe Crafted of lightweight thermal lab quality borosilicate glass Two mouth blown layers make liquid inside seem to float Winner of the prestigious European IF Design Award