MADE OF HAND-BLOWN BOROSILICATE GLASS?Just because they're pretty doesn't mean they're not tough. While lighter and thinner than other mugs, they are made from hand blown borosilicate glass, so the the glass is stronger and has far fewer defects. DOUBLE WALLED DESIGN?Double walled, hand blown glass insulation keeps your coffee hot and your hand cool. No sweat! Also works great for your favorite icy cold drink.The comfortable, wide opening and thick handle is easy to grasp and it fits really nicely into your hand with lots of room for your fingers.The bottoms of these mugs are wide enough to sit flat and wouldn't wobble on the table. THE PERFECT HOT DRINK ESSENTIAL?Insulated glasses with handle so that you can have your cup of coffee, espresso, cappuccino or tea warmer longer and can keep enjoying your delicious, perfect temperature beverage to the fullest. STRESS FREE MAINTENANCE?Easy to clean and durable! These shatterproof, scratch resistant mugs are durable and safe for microwave and dishwasher! Borosilicate glass is the material you want when dealing with any glassware for best results! HOLIDAYS, BIRTHDAYS OR ANY OCCASSION?Espresso, latte, hot and cold, or just about any drink you can think of, these ultra light, clear double-wall mugs are the perfect gift for the coffee lover in your life.