Not bad but..,
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This review is from: first4magnets 89 x 51 0.76mm Flexible Magnetic Labels with Gloss Dry Wipe Surface - White (Pack of 10) (DIY & Tools)
Not bad, they do exactly what they say, but I found that the magnetism of these is exceptionally weak.
You really have to press it flat against a magnetic board to get it to stick. Just touching it against metallic objects does nothing as its magnetism is not a strong enough.