Eisco - 12 Pack Erlenmeyer 25mL Borosilicate Glass Narrow Neck Conical Flasks with Graduations for Laboratory and Classroom Use

I can gladly say that I bought these master pieces, ive knocked everyone of these conical flasks over more than once and from anywhere from 3 feet to almost catching them and watching the glassware fall through my fingers and as my heart about jumped through my throat as they hit the solid 1948 cedar wood floor, they never break or crack or chip, I even had one leap 12 inches in the air because the hot plate hit the liquids, boiling point and the liquid had become almost instantly extremely viscous and thick and the flask hit a cast iron skillet top and then a 6mm thick tempered glass table to still last longer than my "stoney labwares" double stemmed 250ml flask lasted in a sandbath, seriously great work but dont take it lightly as long as you make or provide glassware of this quality I will gladly buy, recommend, and will provide a short video of a simple experiment to show that they take endothermic shock well, and the exothermic properties as well, I even set up a number 1 and 2 stopper, drilled 2 holes and then inserted 2 glass straws and some tubing and it makes filtration 100 times easier

I used these and small beakers to make lab week gifts for coworkers. These were perfect for the job and I ended up buying more for future projects. They were packaged well so no breaks in any of the now 4 sets that ive ordered.will buy more as needed.

They break like they're made of sugar.

The size is perfect to make as a Christmas ornaments!