PTFE magnetic stir bar is made of PTFE and high quality magnetic steel, smooth surface, reduce friction and improves smooth rotation.These are PTFE coated magnetic stir bars, works perfect, these have been extremely valuable with mixing solutions together.Magnetic stir bar can resist high temperatures, corrosion, abrasion and high rotational forces, and has the properties of fine workmanship, no impurities and burrs on the surface.Magnetic stir bar is widely applied in scientific research, universities, laboratories in the industrial and agricultural sectors, and also can be applied to stir mixed substances.