350cc double layer mug customized heat insulation not hot glass carving coffee mug customized

**Please click [Contact Designer] to remark the engraving content (Chinese, English, Japanese and Korean numbers can be used)** Brand: MSA GLASS ENGRAVING designer hand-carved Material: handmade glass products/hand blown borosilicate glass Heat resistance: instantaneous temperature difference -20°C to 150°C, expansion coefficient 3.3 Size: cup diameter 8.3cm x height 12cm bottom diameter 5cm (manual measurement) 350cc **Custom scope: name or a short sentence** **(Special customization will be quoted separately according to the complexity, and you are welcome to provide customized drawings)** Note: Pure hand-blown glass, there are slight differences in size, shape, weight and thickness, the unique pull-shaped small bubbles on the cup body and the nodes on the bottom of the double-layer cup are required for the process, which is a normal phenomenon, please pay attention to these special instructions before ordering or customer service consultation to avoid small misunderstandings or disputes **Special reminder for double-layer cups** 1. There are individual tiny bubbles, streamline marks, and hand-made marks in hand-blown glassware, which are non-defective products! 2. Small differences in roundness, height, radian, etc. generally exist in products of the same style, which are reasonable phenomena, which are all due to pure manual craftsmanship. This point is also the key to distinguishing hand-blown and machine-made products! 3. The value of manual blown glass is generally 8-10 times higher than that of automatic production line utensils. And artificially blown products produced under the premise of reasonable control have a unique and special value. 4. Due to the double-layer design, there are ventilation holes at the bottom of the cup, which are not defective, and the pores are sealed with special materials to ensure that water will not enter the double-layer (do not soak in water for a long time). The glue point is a normal process trace, not a defect or a quality problem, and it is necessary to pay attention to protect this point during use. 5. It is recommended to use rinsing when washing, and do not soak the bottom of the cup in water for a long time to avoid double-layer water or steam. 6. When washing, do not scrub the ventilation holes vigorously to avoid penetration damage. In view of the above tips, any double-layer water inflow caused by the use of water or steam cannot be returned or exchanged. Please understand before purchasing. **Double layer cup series reference** An air layer is formed between the double-layer glass, which effectively slows down the heat exchange inside and outside the cup. Whether it is filled with high-temperature tea or coffee, or low-temperature ice water or cola, it will keep your hands at a suitable temperature. .