I used these cabochons to make an advent calendar. The magnets are very strong and don't seem to pose any risk of falling off the metal tree to which they are attached. Since the cabochons are glass I tried to avoid sticking together and instead stored them so they wouldn't roll around in a small metal bucket To turn the chunky cabochons into jewelry I colored heavy paper red or green, the cabochon with a pencil circled and drawn numbers in the pencil marks and also added an extra layer to the back of the paper. After drying I used superglue to attach a magnet.
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