Capacity 25 mL. Cell culture flasks with Nunclon modified surface (culture areas of 25cm² to 225cm²) . Filter caps for continuous venting. Ergonomic closure enables opening and closing with 1/3 turn and "Y"-mark allows visual verification of vent position, even when stacked. Angled, wide neck gives easy access to entire growth surface. Graduations are both printed and moulded on the side walls. Certified non-pyrogenic and tested for both monolayer formation and cloning efficiency employing primary cells as well as repeating cell lines. Sterile. Material flasks Polystyrene and material caps PE-HD.