Description: PTFE magnetic stirrer mixer stir bar science lab experiment equipment Stiring bar mixers, coated in white PTFEcorrosion resistance, acid & alkali resistance, high temperature resistance PTFE casing is chemically inert, can be used with corrosive chemicals, and helps reduce friction and wear while spinning For stir a liquid or solution in biological, chemical, research laboratory applications Safe for use in food, and cosmetic applications & pivot ring helps reduce friction, vibration and wear Dia*Length : 7x20mm MaterialPTFEPolytetrafluoroethylene Type B : Octagonal shape Color White Specification: A magnetic stirrer or magnetic mixer is a laboratory device that employs a rotating magnetic field to cause a stir bar (or flea) immersed in a liquid to spin very quickly, thus stirring it. The rotating field may be created either by a rotating magnet or a set of stationary electromagnets, placed beneath the vessel with the liquid. Package Includes: 1 piece PTFE Magnetic Stirrer(5 Pack) Note: Due to manual measurement, there may be 1-2cm error in size Due to the difference between different monitors, the picture may not reflect the actual color of the item