The Corning Pyrex 25mL Glass Flask 24/40 #5641 is a high-quality laboratory flask made of borosilicate glass. With a round bottom design and a volume of 25mL, this flask is ideal for various laboratory disciplines such as physical, dental, medical, microbiological, and biological laboratories. Manufactured in the United States by the trusted brand PYREX, this flask is perfect for chemistry experiments and research applications. It does not come with a stopper, making it easy to pour and measure liquids accurately in a laboratory setting.