They adhere very well to my magnetic board, although the actual magnets are quite small. You'd have a little more power they muster to detach from the panel. Thus, nothing slips which is held by them.
My claim is now not just leave hold tens of pages of a magnet.
What I find particularly good, the shape of the magnet. The magnet is very easy to grip and it breaks no (fingernail) from.
Taste the colors. My taste they met :)
Strong buy recommendation!