How to use: you can 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 can work well with various types of magnetic stirrers or heating stirrers, and is often applied to stir a liquid or solution in scientific research, universities and laboratories Features: the laboratory bar has acid and stability as well as organic solvent tolerance, and is almost insoluble in solvents The maximum temperature is 250 degrees centigrade and the minimum temperature is -196 degrees centigrade Quality material: the rod magnetic mixer is made of quality PTFE, and its cylindrical shape and smooth will reduce friction and improve smooth rotation, nice for laboratory size:7x25mm Material:PTFE colour:White Package Contents: 10 x PTFE magnetic stirrer mixer stir bars Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.