I'd like to give these five stars but there is an issue that seems easy to fix. Each pair has a concave and a convex half. No problem. But only two of my three magnets have interchangeable magnets, meaning my house keys (concave) can be paired with either my car keys (convex) or my wife's car keys (convex) and her house keys (concave) can be repeated. The downside is that the third set repels these two sets because its concave/convex configuration doesn't have the same positive/negative magnet orientation. It looks like a simple QC fix that makes the multipack more useful. While the third set is in the drawer of the table.
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