Karter Scientific Plastic Graduated Cylinders are manufactured from roll-proof and easy-to-read polypropylene plastic. Single metric scale has raised numerals and graduations. Flared top and large spout facilitates easy pouring, and hexagonal shaped base prevents tipping and rolling. The 'nonwetting' polypropylene surface eliminates concave meniscus and makes reading easier and more accurate. Chemically resistant and autoclavable at 121°C (250°F).