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A set of three of the most popular glass Erlenmeyer flasks from Karter Scientific with a Magnetic Stirring Bar. Contains 1 each 50, 150 & 250ml flasks. Made of 3.3 borosilicate glass. Single Scale, Heavy-Duty, beaded rim, white marking spot, and uniform wall thickness throughout. 3.3 borosilicate is the highest level of inert glass available. Designed from ASTM Specification E960, Type I requirements. Magnetic Stirring Bar: PTFE, Octagonal, Pivot Ring with dimensions of 25 x 7mm (1inch). If you have any questions or concerns, please contact us. We are happy to make it right!