UltraCruz^® Cell Culture Flasks with Vented Caps are made from polystyrene and are suitable for various tissue and cell culture laboratory experiments. Treated Cell Culture Flasks are ideal for growing cells that require an adherent surface. Cell Culture Flasks have a uniform hydrophilic surface resulting in consistent cell adhesion and attachment. Growth surfaces of flasks are flat and free from striation to maximize usable growth area and transparency. Cell Culture Flasks are provided with a high-density polyethylene vented cap that contains a 0.22 µm hydrophobic membrane to allow gas exchange and minimize risk of cross contamination. Thick, durable walls and stable base for upright filling, Cell Culture Flasks feature an innovative angled neck design offering excellent pipette and cell scraper access. Cell Culture Flasks include engraved graduations on two sides and interlocking T design for easy stacking.