INSULATED MUG: A set of two double-wall BISTRO mugs, 5 ounces each; perfect as a coffee mug, espresso mug, or a multitude of other hot and cold beverages HEAT RESISTANT: Bodum mug is made of mouth-blown, lab-quality borosilicate-glass construction for a durable and heat resistant glass 2-LAYER DESIGN: Insulated coffee mug 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 AWARD WINNING: Bodum BISTRO double wall glasses are the winners of the prestigious European iF Design Award; 1 year limited warranty Set of 2 double-wall glass espresso shot mugs with 4.7-ounce capacities Mouth-blown, lab-quality borosilicate-glass construction; durable and heat resistant