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There are strong magnets, then there are SUPER-STRONG neodymium magnets. This neodymium (rare earth) magnet can hold several pounds and can even detect magnetic strips in dollar bills and iron-fortified cereal. Attach this to a metal file cabinet, and you will have to struggle to remove it. Measures ~0.47 in. x.75 in. x 1.3 in.
Caution: All Rare Earth magnets, such as neodymium magnets, are made of a ceramic and can be brittle. They are extremely strong magnetically must be handled with caution to avoid damage to the magnets and/or injury. Fingers can be pinched between attracting magnets and magnets can chip or break if allowed to 'jump' at an attracting surface or another magnet. Close adult supervision is required.