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Magnetic stir bars are made out of a magnetic material and commonly coated with a synthetic polymer, PTFE (Polytetrafluoroethylene). They can be used to stir liquids in a sealed container without reacting with the liquid in the container.
10 Pack Octagonal 6 mm x 15 mm Magnetic Stir Bars
10 Pack Elliptical Magnetic Stir Bars 10mm x 30mm
5 Pack Elliptical Magnetic Stir Bars 20mm x 60mm
10 Pack Elliptical Magnetic Stir Bars PTFE Coated
10 Pack 7mm x 25mm Polygonal Magnetic Stir Bars