New in Sleeve of 20 Flasks. 

Specially designed for laboratories where extra security against contamination is necessary Sterile Cap contains 0.22 mm hydrophobic filter, which prevents wetting and bacteria from growing through membrane while allowing quick, stable buffering in aCO2 incubator. Filter membrane has a three-dimensional matrix of polyethylene fibers. Plug-seal cap guarantees maximum seal of flask, permitting gas exchange only through 0.22 mm filter. Certified for optimal cell attachment, uniformity of surface and growth. 9381W30 has a canted neck; volume 50 mL ; cell growth area 25 cm^2