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Description:Plain shape with pivot ring creates more turbulence and a stronger vortex than a round, cylindrical shape or a polygonal shape Built-in pivot ring helps reduce vibration and wear during stirring Teflon (PTFE) casing is chemically inert, can be used with corrosive chemicals, and helps reduce friction and wear while spinning Internal magnet made from alnico V, an alloy of aluminum, nickel, iron, and cobalt Magnetic, Corrosion Resistance, Anti high temperature up to 250 celsius degree Size:ø7x25mm (pack of 5 pcs Plain Shape with Pivot Ring Material: PTFE/ TEFLON; Packed in transparent Box, convenienct to collect