The 400 ml beaker is roughly the size of a coffee cup and extremely popular for use as scientific themed kitchen or barware. Easy to use, easy to clean, dishwasher safe and easy to replace if necessary. Pyrex glass can hold hot or cold fluids, but the glass is not insulated to be careful if filling with hot fluids. Mix the perfect cocktail by knowing exactly how many mls of mixers and booze you're using! Drinking beakers are new and have not been used for actual lab work.