Teocera Espresso Cups Shot Glass Coffee Set of 4-2.7 oz Borosilicate Glass Coffee Mug, Clear and Durable Double Walled Mug Sets with Insulation, Good for Espresso Coffee, Tea, BeverageQUALITY BOROSILICATE GLASS Due to the coffee cup make of high borosilicate glass, it is lighter and thinner than regular glasses, capable of withstanding thermal shock, scratch, and break resistant. DOUBLE WALL DESIGN & INSULATION Double wall thermo insulated espresso mugs design, never worry burn hand. And more, the glass coffee cup is keep coffee or beverage hotter and cooler than ceramics mug. SUITABLE SIZE Coffee cup set holding 2. 7oz, suitable