Double-Walled Insulation: Our coffee mugs boast a distinct double-walled design, coupled with a silicone lid, that locks in the heat for up to two hours during cold weather, making your hot coffee stays , longer. Simultaneously, the insulated layer protects your hands from scalding. High Durability: These coffee mugs are crafted from superior borosilicate glass, possessing a thermal expansion coefficient only a third of typical glass. This unique feature guarantees the mug can easily survive an instant temperature difference of up to 392, promising you exceptional . Versatile & Portable: Fashioneed with an attractive form, and compact, these mugs fit perfectly in most cup holders. You can your coffee, tea, wine, or juice elegantly. Perfect for varied indoor and outdoor occasions, such as commuting to work, office, parties, traveling, or simply . User-Friendly: Our cups present a convenient black silicone lid with a handy opening for comfortable one-hand use. Also, the transparent borosilicate glass offers a robust grip. Both mugs are designed to be dishwasher and microwave safe, ensuring easy cleaning and reheating. Choice: The reusability of this to-go coffee cup makes it an eco-friendly choice to give your loved ones, friends or colleagues. It suits a wide range of celebrations like housewarmings, birthdays, Christmas, anniversaries, Mother's Day or simply as a thoughtful, zero-waste gift. [Warm reminder] There will be an adhesive spot at the bottom of the double-layer cup. This is a normal workmanship mark and is not a defect or quality problem. It can be used normally during use. Do not dig out the adhesive spot. Mind taking photos with caution. size: 16 x 9cm Material: High borosilicate glass + silica gel colour: black+transparent Package Contents: 2 x Double Walled Glass Coffee Mugs with Silicone Lids Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.