B. Non-treated, Vented Cap, 40/case C. Non-treated, Plug Seal Cap, 40/case D. CC-treated, Vent cap, 50/case Cell culture flasks (also referred to as tissue culture flasks) are designed in three types of area for cell culture: 25 cm2, 75 cm2 and 175 cm2 Engraved graduation on both sides helps users to fill accurate volume of medium Marking area is made to identify flasks for different purpose and ridges on the top make flasks easy to stack Neck angled design- easy for pipette access into touch each corner of flask Caps are available either in plug seal cap (typically applicable to airtight culture & cultures requiring venting when cap is left partially open) and vent cap (designed for open culture and includes one piece of hydrophobic membrane of pore size of 0.2 um) Membrane prevents gas from contaminating culture in the process of exchanging gas. It's recommended to use a CO2 incubator for vent cap flasks, especially for long-term cell cultures Features USP Plastic Class VI Polystyrene 2.25 cm2, 75 cm2 and 175 cm2 Suspension culture and adherent culture for choices Vent cap and plug seal cap for choices RNase-free, DNase-free, Sterile Non-pyrogenic, non-toxic SAL level 10 -6 Packaging Lot number is printed on packaging for tracking Zip bag packaging is easy to open Cartons are customized for protecting products