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Thomsons Ultra Yield Flasks (patented) are so named because these flasks actually enhance the growth of E.Coli as well as other microbial cells. The patented design of the flasks renders them to an improved microbial cell yield. We offer these flasks in standardized sizes of 125mL, 250mL, 500mL and 2.5L. The flasks can be closed snug using our AirOTop seals. These seals are designed to fit on the flask-tops. We also offer aeration caps for long-term use for our Flasks for such uses as CHO as well as other suspension cell growth.