It is crafted from high-quality amber Boro 3.3 glass, providing excellent chemical resistance and thermal durability. Class A certified, this flask ensures precise and reliable liquid measurements. The flask features a NS 10/19 neck size, making it compatible with a wide range of laboratory glassware, and includes a PE stopper for secure sealing. The white scale provides clear visibility for accurate 20 mL measurements, and batch certification ensures traceability for quality assurance. This pack of 2 flasks is ideal for small-volume chemical, pharmaceutical, and educational laboratory applications.