Casa Bellante (Set of 4) Double-wall Stemless Wine Glass - 10 oz. Borosilicate Glass Casa Bellante 10oz Double Wall Stemless Wine Glass - Set of 4 Double-wall thermal insulation - double-wall wine glass creates an insulation effect which prevents condensation and keeps your liquid colder for longer Top quality borosilicate glass - double-wall design creates elegant floating appearance while adding strength and durability Handblown by expert craftsman - each wine glass with be unique due to the handblown process Dishwasher and microwave safe; not for use with metal utensils