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 types of magnetic stirrers or heating stirrers, and is commonly used for stirring liquids or solutions in scientific research, universities, and laboratories. Features: The laboratory stir bar offers acid and alkali resistance as well as tolerance to organic solvents, and is nearly insoluble in most solvents. It operates within a temperature range from -196C to 250C. Quality material: Made of high-quality PTFE, the cylindrical stir bar has a smooth surface that reduces friction and ensures efficient, smooth rotation for laboratory use. Size: 8x25mm / 7x25mm / 8x40mm Material: PTFE Color: White Package Contents: 16 x PTFE magnetic stir bars or 10 x PTFE 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 error allowance is +/- 1-3 cm.