Corning Pyrex Griffin Low Form Borosilicate Beakers, 250 mL Capacity (Pack of 12) Griffin-style beaker with a spout for use in education, chemistry, research, and life science applications Borosilicate glass for clarity, strength, heat-, and chemical-resistance Uniform wall thickness for optimum balance between thermal shock resistance and mechanical strength Double-graduated metric scale markings in 25ml intervals and an extra-large marking spot for ease of use Meets American Society for Testing and Materials (ASTM) E960 specifications for