Magnetic stirrer bar, very powerful, for large quantities and/or viscous media, stirring over distances, for unfavorably shaped bottoms, 4 × higher torque, unrivalled increase of mixing effect, significantly higher speeds can be reached, no de-magnetization effect, concave shape for minimum contact surface while operationally reliable rotation is ensured, 300% less PTFE wear, triangle contour for high shearing load, added mixing effect at lower speeds, smooth and sealed PTFE coating, pursuant to FDA regulations, suitable for steam-sterilization at 121°C, significant power increase for all magnetic stirrers.