Plain Stir Bars provide more turbulence at low speed and have a similar action to cylindrical stirrer bars. Stirrer magnets are made from FDA approved PTFE. They feature Alinco V magnet cores and Isostatic encapsulation to eliminate cracks and porosity. PTFE Stir Bars have a polished finish to reduce pick-up and cross contamination. They can be sterilized using thermal or chemical means.