How to use: Place inside a container of liquid or solution that is seated on a magnetic stirrer, and use a rotating magnet or multiple stationary electromagnets to create a rotating magnetic field. Wide application: The stir plate magnet bar is compatible with various magnetic stirrers or heating stirrers, and is commonly used to mix liquids or solutions in scientific research, universities, and laboratories. Features: The laboratory stir bar offers acid resistance, stability, and tolerance to organic solvents; it is nearly insoluble in solvents. Maximum operating temperature is 250 degrees Celsius, and minimum temperature is -196 degrees Celsius. Quality material: The magnetic stir bar is made of high-quality material. Its cylindrical shape and smooth surface reduce friction and enhance rotation performance for laboratory use. Size: 7x25mm Material: PTFE coated Color: White Package Contents: 10 x Magnetic stir bars Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3cm.