Not as strong as I expected

These magnets are thinner and not quite as strong as some that I purchased before. I got these because there were so many in a pack, but next time I would get the ones I ordered before. I purchased these to use in an art gallery to hang works on paper on a steel wall. Some of the artwork is pretty large and I need extra magnets to ensure they stay up. But I found that if I double them up, they hold better.

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