Heat resistant Borosilicate glass, similarly to pyrex type glasses. Fits all Bodum 3 cup French press coffee makers..
NOTE: Beaker capacity sizes are stated in standard 4 oz. coffee cups. Were not sure who in the world drinks a 4 oz. cup of coffee... seems kind of like running downhill with your mouth open... but, nevertheless, thats how they are sized. We strongly recommend checking ounces on the specs listed below to be sure this beaker is the right beaker for you.