Bel-Art Spinbar Teflon Polygon Magnetic Stirring Bar; 70 x 10mm， White， Pivot Ring (F37122-0070)</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Polygonal shape is smoother than an octagonal shape and creates more turbulence and a stronger vortex than a round， cylindrical shape</li><li>Teflon (PTFE) casing is chemically inert， can be used with corrosive chemicals， and helps reduce friction and wear while spinning</li><li>Built-in pivot ring helps reduce vibration and wear during stirring</li><li>Internal magnet made from alnico V， an alloy of aluminum， nickel， iron， and cobalt</li><li>Casing material is FDA approved for use in food， drug， and cosmetic applications</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/31QLsrVB%2BJL.jpg' noproxy></br>