Double Walled Design – 2-layer thermo glass mugs (8oz, set of 2) helps to maintain the glass as an ideal temperature while allowing the cups stay cool to touch, without burning hands and without condensation. Keep hotter than the single wall shot glass, bring a new level to enjoy the espresso. True Borosilicate Glass and Trpered Shape – glass cappuccino coffee cups is make of high borosilicate glass, it would lighter and thinner than the normal glass but durable and stable. The flared lip of glass cups that makes the shot glasses easier to pick up and hold without spilling. Suitable Size and Space Saving – The glass coffee cups set hold 8oz, suitable for nespresso machine and coffee maker, perfect for enjoying your coffee. you can reheat in microwave or you want drink cold beverage, safe in freezer. It is also dishwasher safe, but recommend wash by hand. An Ideal Gift – Classy and stylish style, espresso coffee mugs give you a chic look. Super sleek shaped and well wrapped in a gift box, these espresso mugs could be the ideal gift for your family or friends especially on special occasions such as birthday, housewarming, wedding, parties, etc. DESIGN–There is a small round hole design on the bottom of glass coffee cup, in order to prevent glass mugs burst when using, allows the glass to breathe in process. It is seal, the water would not go in.