Decent thick enough walls to stand up to regular use. I continue to be impressed with StonyLab glassware.

Perfect for distillation purposes.

Haven't had a chance to use them yet but they appear to be good quality.

Wish I would if had a chance to use this bad boy. I m such a butter fingers thst I literally had this thing in my possession for less then 5 minutes before dropping and smashing it completely. I bet it would have worked great but ill never know. It would be a dope idea to offer glass insurance I cant seem to keep glass anything around for more then a couple weeks tops before breaking or dropping the damn thing.

Bought this in a pinch when a few of our lab flasks broke during washing. While they serve their purpose, I received different volume flasks(I would guess that two were 60ml and two were 50ml) . The neck and fitting did work and were 24/40 standard glassware fitting, so no issue with that and they still worked for our purposes, but something to keep in mind if you need an exact volume.<br>One bonus I would add is that they were made solid and not cheap too fragile.