One of the starting blocks for deciding system scaleability is the round bottom flask. Our two neck round bottom flask is one of many varieties of round bottom flask that we carry in store. Our other round bottom flasks go from a four neck all the way down to a single neck style. This 2-neck RBF is a heavy-walled flask with standard-taper outer joints on both the center neck and angled side necks. All of our Round Bottom Flasks are made up of borosilicate glass, ensuring the highest quality available.