It is made from high-quality clear Boro 3.3 glass, providing excellent chemical resistance and durability. This trapezoidal-shaped flask is Class A certified, ensuring high accuracy for precise liquid measurements. The flask features a NS 10/19 neck size and comes with a PE stopper to securely seal liquids. The blue scale provides easy visibility for precise measurement of 20 mL. Batch identification ensures traceability, making it ideal for use in laboratories, research, and educational settings where accuracy and reliability are critical.