Magnetic Stir Bar 12×30 PTFE Double Cross Head Stirbar

Pictured is a 12 x 30 PTFE Coated Double Cross Head Stirbar, designed for use with tube-like containers.  This stir bar is a very popular all-purpose stirrer.  A stir bar (also known as a flea, spin bar, stirring bar or stirbar) is a magnetic bar used to stir a liquid mixture or solution, usually in a laboratory.  The stir bar’s motion id driven by a separate rotating magnet or assembly of electromagnets (i.e. coils) located beneath the vessel containing the liquid.