High quality Teflon encapsulated magnetic stirring bars ensure efficient mixing with consistent results.Multi-faceted polygon shape with increased surface area creates added turbulence for thorough mixingAbsence of a pivot ring allows the Spinbar to stay close to the bottom of the vessel, enabling "scraping" of solidsOptimal coupling with magnetic spindrive as the entire length of the stir bar is in close contactAlnico magnet encapsulated in FDA Grade, USP Class VI Teflon® brand PTFE Coating for superior chemical compatibilityManufactured in a registered ISO 9001:2015 facility, as verified by SGS certification; autoclave safeNote: TEFLON® is a registered trademark of The Chemours Company FC LLC and used under license by Bel-Art Products, Inc.