These stirbar assortments come in a convenient storage box and provide instant availability of these highly popular Teflon® PTFE encapsulated Alnico magnets.Choose from Octagon, Cylindrical, Polygon, Micro, Egg-Shaped or Spinplus® shaped assortmentsFDA Grade, USP Class VI Teflon® PTFE low friction coating – Superior Chemical CompatibilityManufactured in a registered ISO 9001:2015 facility, as verified by SGS certificationAutoclavableTEFLON® is a registered trademark of The Chemours Company FC LLC and used under license by Bel-Art Products, Inc.