I got the 40 x 20 mm cylinder magnet, and it is strong as can be. Where the steel is thicker on my refrigerator, I cannot pull it off without sliding it to the edge, even though I can fully compress the highest tension grip exercisers. It also looks pretty nice, so when not in use it can be a decorative accent somewhere. Just keep it away from magnetic hard drives and mechanical watches and clocks.I docked it one star only because the current $15 price for one piece seems a bit high to me.
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