* Please allow the little error of the manual measurement.Consider it before buy it. Thank you！ ***This is a thin glass，it cannot be hit by a single point click, so when using a spoon and glass straw, you can't poke it hard, and the ice cubes need to slide off instead of being placed high fall . Note: Our Item is made of Borosilicate glass ,NOT a normal glass! There are some other sellers pretending to use low-quality (industral Glass) glass to pretend to use Borosilicate glass (Cheaper but dangerous). COMPLETELY HAND MADE：Hand blowing from high quality chemistry grade borosilicate makes these glasses thinner, lighter, capable of withstanding thermal shock, scratch, and break resistant.feels great to hold it in your hand. Product name: square mouth water cup Capacity: 250ml, 370ml Material: high borosilicate glass size Small: 6cm wide, 8.6cm high Large: width 6cm, height 13.5cm Scope of application: It is used for drinking scented tea, green tea, black tea, coffee, juice, beverage and milk. It is recommended for daily use at home or office. Material & Maintenance 1. The glass material occasionally has craft phenomena such as bubbles, water lines and scratches. This is a normal phenomenon and does not affect the use and appearance. 2. It can be heated by an open flame and can withstand a water temperature of 30°~150° instantly 3. Try to handle it gently, avoid bumping, and prevent impact rupture caused by falling from high altitude. 4. Do not scrub with an iron brush to avoid scratches and bacteria growth. 5. It is recommended to use neutral detergent to clean in warm water.