Bel Art® Holdfast™ one-piece polypropylene cylinder. The grip handle on this cylinder provides a secure, solid grip for superior control. The result is safer, more convenient pouring. Will not create a meniscus. The "Total Contained, Total Delivered" double scale is accurate and easy to read, and the hexagonal base prevents tipping and rolling. The hand opening is 89 x 29mm (3 x 1-1/8"). Steam autoclavable at 121°C (250°F).