Nunclon™Δ cell culture flasks with surface areas from 75 to 175cm² are available with filter caps or Vent/Close caps for good gas exchange. Short; wide neck (angled or straight) allows easy access to entire growth surface. The Nunclon™Δ treatment is limited to the intended growth area. Neck areas are not treated to prevent cell attachment and growth in undesired areas. Certified pyrogen-free and tested for both monolayer formation and cloning efficiency employing primary cells as well as repeating cell lines. Sterile. Material flasks: Polystyrene. Material caps: HDPE.