Casa Bellante&reg; (Set of 4) Double-wall Beer Glass - 16 oz. Borosilicate Glass Casa Bellante 16oz Double-wall Beer Glass - Set of 4 Double-wall thermal insulation - double-wall beer glass creates an insulation effect which prevents condensation and keeps your beverage colder for longer Top quality borosilicate glass - double-wall design creates elegant floating appearance while adding strength and durability Handblown by expert craftsman - each beer glass with be unique due to the handblown process Dishwasher and microwave safe; not for use with metal utensils