MIN CI 40 Pcs Super Strong Rare Earth Magnets Bar, Small Neodymium Magnet Heavy Duty, for Kitchen Lockers Garage Refrigerator Cruise Crafts Industrial Tool Storage (20 x 10 x 5 mm)

I am not convinced these are N52. They are not as strong as the magnets I brought previously from another source. I would guess these are more likey rated N35.

I've used then in a project I found online in which I make a small hand powered electricity generator. They work well, they're strongly magnetic, they're uniform in size which makes them good for this kind of project (Where they have needed to fit into 3D printed cavities to be held in place). I did accidentally drop them. Magnets are so nice to play with and I was "clicking" then together with one hand and I dropped them, all together, and the impact on a tile floor shattered one of them. I'm lucky, it could have been more than one. I expect that if they were allowed to "click together" from a bigger distance than I could get them apart using only one hand that would shatter them too.

They are good magnets. I got complacent with them, thinking that they were strong due to a metallic look. They do tear out if you keep connect them together and eventually they crack, so not for playing purposes.

Unbelievable magnetic pull for their size. Anyone familiar with these neodymium magnets knows what I'm talking about. They are not decorative but they quietly do their job.

The dimensions are not correct of these magnets. The size says 20mm x 10mm x 5mm and they actually 19mm x 9.3mm x 4.5mm. Not a big deal if you are hanging up posters but it is if you are fitting them into something for a project.