About this item ?ARTISTIC DOUBLE DESIGN?This coffee mugs adopt the design of double glass. Air is sandwiched between the double-layer glass, which effectively insulates part of the temperature and prevents hands from being scalded. The double walled glass coffee mugs have the air pockets that create complete insulation to keep your coffee warm for longer, and our glass coffee cups can also be used for cold drinks without condensation. ?HIGH BOROSILICATE GLASS MATERIAL?The coffee cups are made of heat-resistant lead-free borosilicate glass, which is healthy and environmentally friendly, and does not contain any harmful substances. It is an ideal drinking utensil at present. Borosilicate glass allows glass coffee mugs to withstand sudden temperature changes from -40F to 300F. In addition, the coffee mugs are super easy to clean, with a simple hand wash to keep them clean, or you can use the dishwasher, too. ?CONVENIENT AND ANTI-SCALD HANDLE? This coffee mug features a convenient handle. The glass handle is ergonomically designed for easy handling and prevents burning hands. Whether it is freshly extracted espresso liquid from a French press or freshly heated milk froth, it will not burn your hands, and it is also a good choice to take it outdoors for camping. ?SAFE VENT HOLE? The Double wall glass has a pinhead-sized hole somewhere in the glass. These holes will not let water/steam/condensation water enter, which can well reduce the glass bursting during use. Water and air can only be expelled, not entered. They will be completely hermetically sealed. Therefore, our double-layer glass coffee mugs have high safety and long service life. ?WIDE VARIETY OF USES? Crystal clear appearance, smooth and delicate lines, good hand feeling. glass coffee cups feature a unique curvature that pairs perfectly with your espresso machine or coffee machine. The clear glass insulated coffee mug is perfect for brewing tea, coffee, latte, smoothies, desserts and juices, and comes with a beautiful gift box. Suitable as a Valentine's Day gift, Christmas gift.