What is this?Magnetic stir bars are used to stir liquids or solutions in the biology and chemistry field, research laboratory applications, etc.What will I get?7 Size of Olive Shape Magnetic Stirrer (D x L):3 x 6mm/0.12 x 0.23inch3 x 10mm/0.12 x 0.39inch3 x 12mm/0.12 x 0.47inch3 x 15mm/0.12 x 0.59inch6 x 20mm/0.23 x 0.78inch6 x 25mm/0.23 x 0.98inch6 x 30mm/0.23 x 1.17inchSize of Straight Bars: Rod diameter: 7mm/0.27inch; Head diameter: 10mm/0.39inchIn the package of: 1 set x Magnetic stir set(each size 1pcs)Are there any advantages of the product?The magnetic stir bar is made from magnet with PTFE coating, the coating is corrosion resistant and has good resistance to high temperature(temperature tolerance range:-180 ℃~250 ℃), smooth surface, reduce friction and improve smooth rotation, easy to clean. with Ring shape, more suitable for flat-bottomed containers, with better rotational stability and better stirring effect.How to use it?Usually used with a magnetic stirrer or heating stirrer, quieter, more efficient than other stirrers. What should I notice?Please place the magnetic stir bar in the bottom center of container when use.The magnetic stir bar is reusable, please wash and dry it after use for next time use. Keep away from iron and other magnetic materials, so as not to affect the magnetic properties of the magnetic stirrer. It should be replaced when the appearance of the magnetic stirrer is obviously worn, or the magnetic force has faded seriously