• Virgin polystyrene flasks • Easy to read volume scale • Easy to stack • Packaged in "peel-off" bags • Treated for cell cultures • Sterilised by gamma irradiation • Certified as being RNase and DNase free • Certified as having an endotoxin level of< 0.5 EU/ ml • Certificates available upon request • Batch number and expiry date printed on every flask • Model with filter cap: hydrophobic membrane prevents passage of bacteria, spores and particles larger than 0.2 µm