These plastic media bottles are manufactured from Polyethylene Terephthalate which provides the clarity of glass, the strength of plastic and a space-saving design. Tested superior for pH stability, temperature durability, cloning efficiency and cytotoxicity. Supplied with caps pre-attached and shrink-wrapped in convenient trays. Lightweight, permanent in-mold graduations, no-drip pour lip which avoids content from dripping down the side of the bottle, 20% headspace for additives. 500mL Capacity. 75 L x 75 W x 175mm H. Polyethylene Terephthalate. Square Shape. 50mL Graduation Interval. Wheaton #: 219979.