Nalgene 4112-0250 PETG 250mL Sterile Cell Culture/Erlenmeyer Flask (Case of 12) 250mL sterile, disposable, clear glycol-modified polyethylene terephthalate (PETG) Erlenmeyer flask with flat base for shaker and suspension cell culture, media preparation, or storage High-density polyethylene (HDPE) leak-proof cap opens to vent with a quarter turn Gamma-irradiated flask provides a five-year shelf life, a 1E-6 sterility assurance level (SAL), and is non-pyrogenic and non-cytotoxic Measures 136.9mm high, with an outside diameter of 82.6mm at the widest part of the base and an inside diameter of 26.4mm at the neck Molded-in graduated markings indicate approximate volume measurements in 25mL increments