8.5oz, lead-free high quality borosilicate-glass, meet hot or cold will not broken like normal glass, dishwasher and microwave safe. Double wall insulated, keep hotter and colder, cool to touch, without burning fingers. Smooth finish, crystal clear look, drinks will seem to float in mid-air. Perfectly for cappuccino, Americano, tea, coffee, latte, mocha, beverage, etc. Besides also have 3.4oz, 7.5oz, 12oz, 15oz,