The functionality of science glass with the industrial ruggedness of concrete. The 1000ml boiling flasks is constructed of scientific grade-glass that can withstand both extreme hot and extreme cold liquids. The concrete base both cradles and supports the glass flask, and can serve as a warming or cooling plate. Perfect for serving soups, coffee, hot chocolate, tea, ice cold water, lemonade, or fun entertaining beverages. The flask holds an entire bottle of wine and acts as a fabulous decanter!