These magnets are strong. They can be difficult to separate, unless you used the plastic rings in between. They WILL break if not handled properly. I normally don't let students use them unless carefully supervised. They are fascinating by magnets and will forget to handle them with "care". I lost 3 magnets with a student watching them "slap" together. Lesson learned by both of us.This does not mean they are low quality. In fact, they great quality. Don't judge quality based on the abuse the product was subjected to.
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