Xtozon 5MM 216 Pieces Magnetic Balls, Buckyballs, Magnet Sculpture Building Blocks Toys for Intelligence Learning - Executive Desk Toys & Stress Relief for Adults (Shiny Silver)

5mm is too small. And these magnets are weak, easily dented. They make a strange noise against each other when strung in a single line. I've had better experiences with larger magnetic balls

It wasn't as fun as I thought it would be. Not as easy to make shapes with.

My kids love playing it

My son loves them

My son and I have had a blast with these, our current favorite use is making silly faces on the fridge and changing the face while the other is not around. They are the perfect figet toy while we are doing school work and such. I definitely prefer these over the 3mm, they are still small, but easier to work with. Plan to purchase again as gifts in the future