Cell culture flasks manufactured from high quality transparent PS that allows an optimal microscopic inspection of the cells. Angle neck to facilitate medium mixing without risk of pouring.rTwo types of plugs: plug of two positions that allows the plug to be completely closed or there is gas exchange between the inside and the outside of the bottle; and plug with vent that has a 0.2µm filter for a constant sterile vent.r- Sterile according to DIN EN ISO 11137r- Non-pyrogenic/Endotoxin-freer- Non-cytotoxic according to DIN EN ISO 10993r- Batch and expiration date in each flask