Super magnets that can hold it together. They have a proven track record as newspaper holder and bicycle clamp. Their adhesive force is not afraid of thick fabrics either: They go through four layers of jeans when used as a bicycle clamp.
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On a magnetic glass board
these cube magnets go nicely with S-10-10-N
disc magnets. Their adhesive force leaves nothing to be desired, and at the same time they are unobtrusive with their 7 mm edge length.