Dynalon Stir Bar Oct Red, Ptfe 0.3125 X 0.5"

Dynalon stir bar oct red, ptfe 0.3125 x 0.5" ;
octagonal color-coded stirring bars feature… alnico v magnetic cores which are one of the most powerful permanent magnet alloys available.
stir bars should not… be stored in a random mass or dropped on a hard surface, especially steel.
octagonal colored stir bars should… be stored in pairs to maintain magnetic strength.
in general…ptfe thickness accounts for 18% of stir bar diameter.
colored stir bars may leach in harsh chemicals - DYNA