The Vintage Fleaker Beaker by Corning Pyrex No 5900 is a high-quality, 500 ml beaker made of borosilicate glass, a durable and resistant material commonly used in laboratory settings. This apothecary lab beaker was manufactured in the United States by the trusted brand PYREX, ensuring its reliability and precision in measuring and mixing liquids. With its classic design and large volume capacity, this beaker is a valuable addition to any healthcare, lab, or dental supply collection.buy as pictured lot of 3 could used a cleaning