Heavy duty bars for use in stirring large volumes of fluid in vessels on large magnetic stirring machines such as the Cool Stir Large Volume Stirrer, H37028-0001 or other large machines. Will fit into vessels with a minimum neck diameter of 32mm. Multifaceted surface adds turbulence relative to similar size smooth cylindrical stirring bars. Alnico magnet encapsulated in FDA Grade, USP Class VI PTFE low friction coating. Autoclave safe.