Magnetic stirring bar. Fast mixing action provided by discs which work like mixing “spoons”. Greater stability and turbulence. Less drift at high speeds. Performs well in problem liquids, highly viscous mixtures, fluids containing metal particles, and round-bottom beakers. All models have solid Teflon® end 20 mm diameter discs, as well as 8 mm diameter magnetic bar. Teflon®-enclosed Alnico V magnets.