Description: Drinking Tumblers: The insulated glasses are hand blown from high borosilicate glass Double Walled: with double walled structure, the insulated glass mugs keep cold drinks cold and hot drinks hot while there is no condensation from outside layer. 140ml/170ml Optional, great for tea, lemonade, beer, smoothie, fruit juice, milkshake, coffee like latte, cappuccino, and other summer time beverages The high transparency looks of these insulating glasses offer a good view of your table. Safely goes in the microwave and freezer. Not Safe in Dishwasher. Borosilicate Glass Coffee Mug: Made of High-Quality borosilicate glass, it's more heat-resistant and lightweight, but durable than normal glass. Specification: Material: Glass Size: approx. 140ml - Caliber: 8cm/3.15in, Height: 10cm/3.93in, Bottom diameter: 4cm/1.57in 170ml - Caliber: 7.5cm/2.95in, Height: 11cm/4.33in, Bottom diameter: 7cm/2.75in Package Includes: 1 Piece Glass Coffee Mug Note: Please allow slightly measuring deviation due to manual measurement.Customer satisfaction is our primary concern. If the product is somehow cracked or broken during shipping, please feel free to contact us. We will try our best to give you a satisfactory solution.