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, and research laboratory applications Safe for use in food, and cosmetic applications & pivot ring helps reduce friction, vibration and wear Material: PTFE 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:(7 Pack) 1pc Magnetic Stirrer