1. The insulated coffee mug is made from borosilicate glass material. 2 layer with a smooth and clear look, your drink will seem to float in mid-air, what's amazing!2. You can easily see how much of your drink has left through durable clear glass. Comfort-grip handle will help you to grasp your coffee mug in a warm and affectionate embrace, also makes it easy to drink from.3. Keep your fingers from burning with heat transfer resistant glassware, so beverages stay warm while you stay safe and cool4. You can fill in 250ml liquid in each mug, which is large enough to nicely go with espresso machines or coffee makers. Suitable for use at the home, school, office, coffee house, or bar.5. The special design make it the ideal gift for Christmas, Thanksgiving, housewarmings, birthdays, anniversary, Valentine's Day, Mother’s day, or other special days. etc