TRYMAG 160Pcs Refrigerator Magnets, 6x3mm Small Round Rare Earth, Multi-Use Disc Tiny Neodymium Magnets for Fridge, Premium Cylinder Office for Whiteboard, Crafts, Nail Cutter

Didn't think I'd ever end up with a "favorite brand of magnets" but it's these. Good clean coating that doesn't leave residue, and good strength for their size. I like the black option. Yes they're very small, and the listing says so clearly. Glance at a ruler and you won't be surprised.

Small, but mighty! I use these for my air dry clay magnets. They’re perfect!

right size, strong magnet works great

Rare earth magnets are quite powerful compared to the basic ones you have used in the past. These hold more weight than expected. Impressed!

Perfect

Love these magnets.

These magnets have some serious strength. Just what I need for my projects.

I got these to hold a small cabinet door closed. They are not powerful enough. I think I should have bought an 8mm or even 10mm. Fortunately, you can double them up (in pairs or triplets) which does increase their power.