Getue LOVIMAG Cup Magnets, Industrial Strength, Round Base Magnets, 12 kg Holding Force, Pack of 12

These are pretty strong magnets and they worked perfectly for my need.

Very strong magnet

This review is for the 25mm round magnet in a cup. I use these outside (Phoenix area) under a gazebo. They are great for what I am using them for, but the cup part of the magnets do rust. The magnet part which has some kind of metallic coating on it has not rusted so far. See pictures. The supplied screws also have not rusted. These have been in use outside for about two years. I also have these stored indoors and in my garage and these ones have not rusted. If you need something for a moist, wet environment that will not change appearance due to rusting, these are not for you. Holding power is pretty good. The true magnetic side is the side where you see the magnet where the screw enters from. The other side, the cup side, is only very slightly magnetic. Barely enough to hold itself to some metal surfaces, but certainly not enough to also hold something with the exposed magnetic side. You have to mount it with the screw hole provided. The screw tightens against the magnet so if you tighten too much, the magnet will break. Neodymium magnets are notoriously brittle. That is why so many of them are somehow supported by other metal such as these cup shapes. I'd buy these again and I have bought these twice for my use. The rust doesn't bother me in my use case. They could improve them by using actual rust proof/resistant metal for the cup.

WOW! super strong and just what I needed. I mount these on the wall to provide magnetic anchor points for a white board and boy do they hold strong. I lost the magnet to my trendmill and just tied a string around the magnetic loophole and a simple clothsline clip and macgyvered a solution. Works great now. I really love the strength of these magnets and that they have a hole for mounting.

incredibly strong. perfect for my application . fast delivery. highly recommend purchasing if you are looking for magnets that exceed expectation