Bodum Bistro Double-wall Insulated 10-ounce Glass Mug - (Set of 4) Set of 4 double-wall mugs measuring 3-1/2 by 5 by 4 inches and holding 10 ounces each Lightweight, thermal, borosilicate glass; 2-layer construction resists heat and prevents condensation 2 wall layers make liquid inside seem to float; mix and match with Canteen, Pavina, and Assam lines Winner of prestigious European IF Design Award; 1-year limited warranty Safe for dishwasher and microwave use; not for use with metal utensils