Double-wall 16 oz Borosilicate Glass &nbsp;Coffee Mug Cup(with cap) IDEAL CAPACITY: 16-Ounce; perfect for serving tea, coffee, whiskey, juice and others. ELABORATE DESIGN: Durable double layer construction remains cool and prevents condensation. SAFE WASHING: safe for dishwasher and microwave use; not for use with metal utensils TOP QUALITY: made of lead-free borosilicate glass, its heat-resisting and brilliance. Absolutely no air bubble on the walls.(up to 520F ) WARM REMINDED: There is a small hole in the bottom of the cup, which is the unique trace of the manual blowing process.Not a flaw