The glass-clear straw that is bent is handmade out of borosilicate glass. Therefore, making this the strongest type of glass that can be used for glass straws. In other words, it can withstand temperatures below freezing and up to 816 degrees Celsius and can be cleaned in the dishwasher.
The diameter of the straw is exterior – 12mm and interior – 8 mm
*AS ABOUT THE STRAW SLEEVES: Makes traveling with your straw much easier. Keeps it clean and safe inside your handbag or car.