Be sure to think about what you use them for. If you want to use them for identification, they're great! It would be a lot of fun for kids or classes. If you want them to do projects of any kind, there might not be enough of them to actually do it. I was thinking of a mini mosaic or something but each little jar has 8 to 16 little pebbles which won't work if that's not enough. Reusing ingredients or not making too many of them. Remember that corks are not that solid. they pop out easily. In any case, they are great! Just make sure you have a good application that supports a fairly limited amount but benefits from variety!
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