Sukkiri Square Mug - WITHOUT STRAW Material: Borosilicate Glass Color: - Yellow - Teal - Blue - Green - Amber Size: L - 6cm W - 6cm H - 13.5cm Capacity: 350ml - 400ml Used for: - Water - Juices - Smoothies - Iced Coffee - Hot Coffee - Tea Microwave and dishwasher safe. What is Borosilicate Glass? It incorporates silica and boron trioxide as its main glass-forming constituents - safe and environment-friendly chemicals that makes this type of glass heat-resistant.  Does it easily break? Although it can withstand high temparatures and it is more resistant to thermal shock compared to tempered galss, EXTREME TEMPERATURE CHANGES may still BREAK it.  Can you use it for hot drinks? YES ***We try to edit the photos as life-like as possible but actual colours may slightly vary due to photographic lighting or your monitor settings.