Usage: Used to stir a liquid or solution in biological, chemical, and research laboratory applications. Using way: Placed inside a container of liquid or solution that is seated on a magnetic stirrer, creating a rotating magnetic field using a rotating magnet or multiple stationary electromagnets. High quality material: PTFE casing is chemically inert, can be used with harsh chemicals, and reduces friction while spinning. Perfect design: Built-in pivot ring helps reduce vibration and wear during stirring; different shapes create various vortexes for efficient and effective mixing. Different size set: Assorted sizes meet a variety of application needs. Specification: Colour: White Material: PTFE Package Contents: 10 x Magnetic stirring rods Note: Light and display differences may cause the color of the item in the picture to vary slightly from the real thing. Measurement allows an error of +/- 1-3 cm.