I'm well aware that many magnets are brittle and being a machinist by trade, I'm pretty good at sizing things.\n\nIn reading some of the comments\/reviews on the product pages and knowing a little about magnet poles, I guess you have to orient them to each other or they could repel. I checked my KEF speakers and it's definitely magnets both sides. The ones on the grills are those weak, soft stick-on type like you see with so many "refrigerator magnet" products. I have no clue what lies beneath the veneer on the speakers. I just wouldn't want anything loose in the speaker cabinet that could rattle when the grills aren't on.