The CHEMGLASS Glass 250mL 24/40 Heavy Wall Round Bottom Flask CG-1506-17 is a high-quality laboratory glassware product manufactured by Chemglass in the United States. This flask is designed for physical laboratory and chemistry lab applications, making it ideal for various research and experimental purposes. With a volume of 250mL and a 24/40 outer/female joint, this round bottom flask is made of borosilicate glass for durability and reliability in lab settings. This specific model is a reliable and essential tool for those working in the field of laboratory chemistry.