Like new used once double-wall pavina glasses, 2. 5 ounces each Perfect for espresso Heat resistant: Bodum glass is made of mouth-blown, lab-quality borosilicate-glass construction for a durable and heat resistant glass 2-Layer design: insulated glass has a sleek 2-layer design that creates a dramatic optical illusion and prevents condensation Microwave safe: quickly reheat your Coffee in the microwave and toss in the dishwasher when you need a clean; microwavable and dishwasher safe mug