Mini-thing with strong adhesion!

These exceed all that we had tried so far!
The little things keep fully filled envelopes to much better than the conventional Wall magnets.
Nothing slips. It stays where it is.

Visually they appear quiet and unobtrusive.
The big colorful often rob the overview and seem chaotic on the board.

To resolve them are not really that hard.
With a pinch grip of thumb and forefinger, and with the help of nails is not a problem, but a fine motor exercise ;-)