Originally Posted by Matt in SV
Maybe you could put an adhesive felt circle on one of the magnets to soften its grab a little, and keep the pair from cracking in transit?
Never had one crack in transit, but I've had the larger magnets shatter when I'm playing with them. That's bad because they shatter into tiny, sharp bits of heavy metals, and could get in your eye, and so you gotta clean them up.
The little ones I've used for magnetic catches have never had that problem. Not strong enough to smash or pinch fingers.