● Unused Contents have been checked. *Please refrain from purchasing if you are seeking perfection. Set of double-walled drink mugs. Innovative double structure that keeps warm drinks warm and cold drinks cold. Also suitable for soup and cold desserts. Made using a blown glass process and heat-resistant borosilicate glass. Hydrophobic silicone vent to maintain even air pressure between the two glass layers. Dishwasher, freezer, microwave, and oven safe (up to 180°C). 400ml / 13.5oz *Please refrain from purchasing if you are overly concerned about details. *Shipping is not available to remote islands due to additional costs. Some items may be available for shipping; please consult in advance via comments. *Packaging will basically be simple, using bubble wrap.