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A set of four popular glass Erlenmeyer flasks from Karter Scientific with a Magnetic Stirring Bar. Set contains 1 each 50, 150, 250, and 500ml flasks. Magnetic Stirring Bar: PTFE, Octagonal, Pivot Ring with dimensions of 25 x 7mm (1inch).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. If you have any questions or concerns, please contact us. We are happy to make it right!