This is a 10 pack of disk magnets 1.5 inch (38 mm) diameter x 1/8 inch (1.5 mm) thick. They are fairly strong magnets due to their size (and that they are neodymium). The description says that they can hold 8 lbs and that seems about right.

One magnet can effect another through over an inch of material from my testing.

I 3d printed a fishtank scraper that clips onto the magnet to clean algae off the inside of my acrylic tanks and the other magnet pulls it along well.

There’s not much else to say other than they seem like good quality strong magnets.

They are currently available for $14.95 on Amazon: https://www.amazon.com/dp/B01MZCZ3X8

I made a short video about them which you can see here: