DIYMAG 40x20mm Super Strong Neodymium Disc Magnet, N52 Permanent Magnet Disc, The World's Strongest & Most Powerful Rare Earth Magnets - Two Piece

These magnets are every bit as strong as they are advertised, almost too strong for any practical application. The vendor mentions that they can be separated by sliding them. This is true, but they have to be separated by mechanical process. They had a plastic separator between them when they were shipped, and I could not get them separated without using an old breadboard which is the same width as one magnet and sliding them apart. Be VERY careful when separating, because the risk of them joining again and pinching you is high. I've worked with Neodymium magnets making brushless motors, speaker drivers, etc., so I have a lot of experience handling them. I ended up carefully combining the four magnets I had using a wedge, because separately, they were too much of a menace if they got anywhere near each other. I also wrapped them in vinyl tape so they wouldn't chip or break, plus that was the safest way to experiment with them. The four magnet set is stored in a PVC pipe with end caps since PVC is can't be crushed easily.

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First, these are INSANELY strong magnets. I used them for a physics demonstration, and one of my students was not careful to empty their pockets before handling the magnet and it wiped the magnetic strip on his student I.D. in an instant. They will wreck havoc on your cellphone or computer. Not a toy by any stretch. These magnets are very difficult to separate, even if you are strong, and if they are anywhere near each other, they will come together so violently that they will chip or shatter each other. TAKE CARE! There is very little that you can do to keep these from smashing together once they are less than 5" away from each other. It hurts real pain to get your fingers involved between these. The little plastic spacer provided is not sufficient. I keep mine separated by a 1/2" thick piece of wood, and I can just barely get them apart that way when I want to use them. These are a great value though, super strong, and they perform better than I expected. Hours of fun with steel ball bearings or ferrofluid, and great for all kinds of demonstrations on magnetism.

Amazingggggg. Pays for itself with one use. Works so well. Would recommend to Anyone & buy again in the future. If your hesitant buy it! It will not fail you! 1000/10 stars

The two cylindrical magnets are indeed very strong. The only reasons only 4 stars, as opposed to 5, are given are (1) the paper box that the magnets came in are broken, and (2) one magnet has a dent while the other has blemishes. The two reasons together SUGGEST that the magnets may have been purchased and returned previously. Having said so, the two points are merely cosmetic. The magnets still do what they are supposed to do, so I'm keeping them. Photos are provided for illustration purposes.