For cell culture, Greiner Bio One offers standard and filter cap cell culture flasks with different surfaces. All Greiner Bio One cell culture flasks are made of high-grade polystyrene and are free of detectable DNases, RNases, human DNA, endotoxins and are non-cytotoxic. The specific design facilitates an optimal access of the flask with a cell scraper or pipette. The stacking rim on the top of the flasks ensures firm standing and easy stackability in the incubator. Both sides have a printed graduation for easier filling. In addition to the filter screw cap Greiner Bio One offeres a standard screw cap with secured click-in ventilation position which guarantees the gas exchange within the flasks.