Bel-Art Spinpak Teflon Octagon Magnetic Stirring Bar Assortment (Pack of 6) (F37160-0000)</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Octagonal shape creates more turbulence and a stronger vortex than a round， cylindrical shape or a polygonal 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>Contains six stir bars， two each in the following sizes: 1 x 0.3125" (25.4 x 8 mm)， 1.5 x 0.3125" (38.1 x 8 mm)， 2 x 0.3125" (50.8 x 8 mm)</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/51IlKq9MiVL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41KjEpEuS-L.jpg' noproxy></br>