It is crafted from high-quality clear Boro 3.3 glass, providing excellent chemical resistance and thermal stability. This flask is Class A certified for high-accuracy liquid measurements. It features a NS 14/23 neck size, compatible with various laboratory glassware, and includes a PE stopper to securely seal the flask. The blue scale provides clear visibility of the 200 mL measurement, and batch certification ensures traceability for quality assurance. This pack of 2 is perfect for laboratory applications requiring precise liquid handling for medium-volume experiments in chemical, pharmaceutical, and educational settings.