Komiikka Double-wall Glass Tea Cup Coffee Mug with Lid 14oz Ultra-strong Borosilicate Glass ! lab-quality borosilicate-glass construction; durable and heat resistant. Impressive Thermal Insulation With a glass lid These mugs can hold hot coffee and tea without cracking. Double wall keeps the mug cool to the touch on the outside while your beverage stays warm. Attractive design. Handsomely curved handles and wide-mouth design add charm. You'll be proud to serve guests with these striking glass mugs. Dishwasher safe; Microwave safe; Freezer safe; Not recommended for use with metal utensils; Length9.6cm Width9.6cm Height14.8cm