Come and see our amazing products. This cup is hand blown from high temperature borosilicate glass. Perfect for you to enjoy the flavors of teas or coffee without metal or plastic affecting the tasteThese double-walled coffee mugs are perfect for cappuccino, latte, espresso, macchiato, tea, juice, iced beverages, or smoothies.Easy to clean and durable! Notice, there is an air vent in the bottom,our master leave this air vent to resolve the unstable presure between cup internal and external environment during produce process.For this air vent, cup can be used safely although temperture rapid change. Pls confirm with us about the packing info, stock color and exact production time before placing your order.