PYREX Griffin Borosilicate"Even Then, You Knew" Glass Beaker Mug - Low Form Graduated Measuring Beaker with Spout – Premium Scientific Glassware for Laboratories, Classrooms or Home Use - Boy, 1/Pk

"The unique chemically stable, heat-resistant, low-expansion borosilicate formula of PYREX glass from Corning has been trusted by scientists for more than 100 years.

The uniform wall thickness of PYREX beakers provides an optimum balance between thermal shock resistance and mechanical strength."