Set of two, 12 oz. double wall mug. Top quality borosilicate glass construction; durable and heat resistant. Double-wall design creates dramatic optical illusion, prevents condensation, and creates a rounded rim for comfortable drinking. Will keep temperature of liquid hot or cold for a longer period of time, while the outer glass remains safe to touch. A design that is practical and visually appealing makes this an exciting product for any home, restaurant or special gift. Dishwasher safe; microwave safe; freezer safe. Not recommended for use with metal utensils. All Epare products are backed by the Epare Limited Lifetime Warranty.