It is crafted from high-quality clear Boro 3.3 glass, providing superior chemical resistance and thermal durability. This flask is Class A certified, ensuring precise and accurate liquid measurements. It features a NS 19/26 neck size for compatibility with a wide range of laboratory glassware and includes a PE stopper for secure sealing. The blue scale allows easy visibility for accurate 500 mL measurements, and batch certification ensures traceability for quality assurance. This pack of 2 flasks is ideal for medium-volume laboratory applications in chemical, pharmaceutical, and educational settings where precision is critical.