2Pcs Octagonal Gear Shape PTFE Magnetic Stirring Bar Corrosion Resistant Laboratory Stirrer Bar Mixer Stir For Biology 2Pcs Magnetic Stirring Shape PTFE Laboratory Stirrer Bar Educational Equipment Supplies For Chemical Biology Research Description _x000D_ _x000D_ The octagonal gear shape stir bar is placed inside container of liquid or solution that is seated on a magnetic stirrer, creating rotating magnetic field using rotating magnet or multiple stationary electromagnets, excellent and useful for mixing and stirring liquid. _x000D_ _x000D_ Features _x000D_ _x000D_ - Color: White. _x000D_ - Material: PTFE. _x000D_ - Size: 4.00X4.00X0.80 cm/ 1.57X1.57X0.31 inch. _x000D_ - No adhesion, temperature resistance, weather resistance, excellent and useful. _x000D_ - Can resist a variety of organic solvents, and is almost insoluble in solvents, useful and reliable. _x000D_ - Can be used with corrosive chemicals, also helps reduce friction and wear while stirring and mixing. _x000D_ - Stir bar with o ctagonal gear shape will work well with various types of magnetic stirrers or heating stirrers. _x000D_ - Can be used any liquid solution in chemical, materials, biology and medical research laboratory. 2 Shape Stir Bars _x000D_ _x000D_