Magnet is strong but the glue holding the metal hook to the magnet is weak. Of two of the three I commissioned, two were released in about a week after owning less than a pound of a plastic-framed patent and the other an 8" x 10" drawing. The one holding the calendar is still there. The glue the manufacturer uses has the power of a sticky note. I'll try to peel off the existing adhesive and use some super glue to see if it holds.
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