LABALPHA 6Pcs PTFE Magnetic Stirrer Mixer Stir Bar, Magnetic Stir Bar, Olive Shape, 30mm/1.18 inch Length

These work great!

The shape seems to facilitate a more quiet spinning.

These do what a stir bar is supposed to do. No surprises. The magnets are very strong. I've used plenty of stir bars in my career, and these are probably some of the strongest I've used. Since these are rounded on the top and bottom, and pretty slick, I could actually spin the magnet and they'd always stop and orient themselves to the north! Most other stir bars I've used will just sit on the counter, so these were pretty fun, as well as usable! We use this size to stir just under a liter of water constantly. Nice vortex at a low rpm on the stir plate. The only problem that we've had (with all stir bars) is that the PFTE coating will "shred" and leave little flakes in the water. I think it's because of a small ridge on the bottom of my container that is rubbing the stir bar. So, now I need to find a flat-bottomed glass container!

This is a great deal on a normally very expensive product. I use something like this at work and they cost significantly more. The PTFE coat is full if not smooth so there is no worry of chemical intrusion even if they snag on fabrics occasionally. They have a good heft to them so they are resistant to slow down or skipping when they run into solids floating in your solution. (i.e.: Ice in my non-Bond martini.) I prefer the lozenge shape so i don't get a lot of scraping on the bottom of the glass. These don't disappoint. I give em the full five and if you are looking for stir bars, i suggest you consider these.

Worked great at first... Set at a very low spinning speed, it created a VERY nice agitation/vortex. But When my heating mantle hit 180-200c noticed next to no agitation. Normally I can pull a stir bar out with and extending magnet, but had to stop every, and empty my boiling flask! Was very surprised after recovering the stir bar, that it wouldn't stick to anything, not even to another magnet! I'd rate these bars with a 0 star if possible! I'll be requesting a refund... BUYER BEWARE!

These magnetic stirrers are so you can put them in a laboratory magnetic mixer and create vortexes in your lab solutions that mix the solution components really well. But it doesn't seem like the people who created the product video for this item understand that at all. In the product video, it shows them putting one of these into a beaker and then proceeding to mix the solution by hand with a ruler or something. That's so silly and incredibly stupid, I don't know what to say. Whoever made this product description video clearly does not understand what these are actually used for.

I work in a lab and have used many different stir bars. I have a cheaper stirrer at home and I tested these out. I used 2 out of the 6 and one was a little more wobbly than the other (which made for the weird wavy vortex) but I cranked the speed up on both far higher than I would typically need for anything and they didn't spin out like many cheaper stirrers do. That coupled with the fact that these cost maybe 1/4 the cost of major lab suppliers definitely makes them worth while. For the photos I just had water in a regular drinking cup and poured some salt in as if I was making a buffer.

Would I like most about these magnetic bars is that they're very large which makes it mix up thicker liquid a lot better and also has a beveled shape were the center of the magnet is laying on the bottom of the glass and the two ends are not touching which will allow liquid to flow under underneath the magnet since the magnet is not flat and straight on the bottom not only that it makes it much better to mix it also stirs a lot better because of the bevel. thank you. a lot larger then i thought which i like a lot