These Wheaton plastic media bottles feature a 30% thicker wall weight, wide mouth design and include linerless screw cap closure. 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. Permanent in-mold graduations, no-drip pour lip which avoids content from dripping down the side of the bottle, 20% headspace for additives. 1000mL Capacity. 91 L x 91 W x 220mm H. Polyethylene Terephthalate. Square Shape. 100mL Graduation Interval. Wheaton #: W219980.