Adhesion to cardboard seems fairly good. But the power of these little magnets is best used on small weights or paper. I decided to use as many as I needed to make some chipboard marble ramps for a sheet metal wall. It takes LOTS OF MAGNETS to hold a 3" wide (total) 24" long piece of 1/8" thick chipboard. Average about 35+. photos tomorrow. It would take less time if the metal wall I'm using was dead. even.
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