Volumetric flasks made with amber-colored borosilicate glass provide precise volume measurement and protection for light-sensitive compounds. Manufactured to Class B standards, these flasks boast a slightly lower accuracy level than Class A, ensuring precision in volume measurements. The flasks come with a solid glass stopper and a single ground-in graduation mark on the elongated narrow neck, allowing for easy and accurate reading. Inscriptions are printed using white enamel for clarity.