Made with high quality 100% lead free crystaline material, Food safe, BPA Free, Passed FDA lab test. Double Wall glass works like a thermo cup, keeps hot drinks hot and cold drinks cold. For coffee drinker, hot coffee always taste superior than cold. Care Instruction: Hand Wash only Double Wall Large 450ml Tumbler, Set of 2 Keep hot drink hot and cold drink cold, Perfect for coffee, Microwave Safe

• INSULATED MUG: 6 Piece double-wall mugs, 15 ounces / 450 ML each; perfect as a coffee mug, espresso mug, or a multitude of other hot and cold beverages
• HEAT RESISTANT: Mug is made of mouth-blown, lab-quality borosilicate-glass construction for a durable and heat resistant glass.
• 2-LAYER DESIGN: Insulated coffee mug has a sleek 2-layer design that creates a dramatic optical illusion and prevents condensation
• MICROWAVE SAFE: Quickly reheat your coffee in the microwave and toss in the dishwasher when you need a clean; microwavable and dishwasher safe mug.
• There is a BUBBLE AT THE BOTTOM of each glass-to maintain the air space between the layers and prevent cracking.