The coffee cup is 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 -40°F to 300°F. In addition, the clear coffee mug are super easy to clean, with a simple hand wash to keep them clean, or you can use the dishwasher, too.Glass coffee mug is equipped with a silicone lid, which can keep your hot drink warm for up to two hours, so you can enjoy your coffee leisurely without being too anxious.
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