Scientific Building with Neodymium Double-Sided Adhesive Review

Ordered these because they were described as super strong neodymium magnets. I needed a super strong magnet for the magnetic slime work I was making. They're not strong enough to attract magnetic slime, but I have other neodymium magnets that are strong enough, so I'm wondering what they're actually made of.

I put 4 of these on a plastic shelf that I intended to use in a metal cabinet, they wouldn't even stand it let alone if I put something on the shelf. Definitely disappointed, ended up just using the few 3M tabs I had left as I can't move them now, but at least they hold up! I would avoid them if you plan on using them with something even moderate weight.

Magnets strong enough to hold heavy stuff. I made screens for our van, sewed on fabric edges and placed magnets about every 4 inches. They are strong enough to hold the screen securely in place. There weren't enough glue dots for all the magnets so I had to add glue to hold the magnets in place so I could see the border with the screen stock.