LOVIMAGSuper Strong Neodymium Disc Magnets with Epoxy Coating, Powerful Permanent Rare Earth Magnets 1.26 inch x 1/8 inch, Pack of 10

Silly me forgot about physics. Don't stack the batteries. As I went to slide another one on, it FLEW out of my hand, and SLAMMED into the stack in the other causing is to pretty much explode. HUGE SPARKS, the magnet was just shards, but wasn't much to clean up since they all just got sucked back in.Besides me being not too smart, I have no complaints. I mostly use them to hang paint brushes to dry, tools, etc. Stronger than I thought they would be. Definitely recommend.Per the web:While stacking magnets can lead to a temporary boost in attraction, it’s important to note that there are physical limitations that prevent an infinite increase in strength.As magnets get closer to each other, their magnetic fields interact, resulting in repulsion rather than attraction.Thus, there is a limit to how many magnets can be stacked before the repulsion overpowers the attraction.

While these are extremely strong magnets, more than half of them shattered into pieces when they clapped against the others from like an inch away.

My external downdraft vent flap opening/closing the when the wind blew.I placed the full magnet on screen, but the downdraft could not open flap. I cut the magnet to 1/3 the size, which now opens the flap.Now the flap would stick to external cover. I put neoprene insulation tape on outside flap at magnet location.Now it perfectly seals the downdraft vent and is unaffected by wind blowing. Now the stove top is much warmer when not use with the temperature outside is very cold.

Totally liked. Best that I have found anywhere.

2 came broke are very thin for very strong magnets don't let magnets attach from a distance so strong it broke one of them 9ne was already broke