KIMAX Class A Colorware Volumetric Flasks are available with markings in four colors. The Colorware flasks are brighter in appearance than traditional glassware with white markings. These flasks are also commonly used to help reduce cross-contamination and for easy identification of glassware between labs. Flask has a single graduation ring blasted on the neck, calibrated "to contain". A Standard Taper ground glass stopper is supplied, along with a durable, color, matte finish marking area for use with an ordinary pencil. Replacement stopper is 850100.