Edit: 7/29/2019 A few mugs I put on my mirror in May are still standing. And I attach things to it every day. They are really strong and durable when you use them on the surfaces they are designed for. Updated rating to 5 stars to reflect this. I've been trying them all over the house since last weekend. They work well on clean (free of dirt, oil, powder, etc.), completely flat, non-porous surfaces such as windows, mirrors, and refrigerator tops. I've attached various things to it and I haven't seen a single error yet. They won't last more than a day on my bathroom walls, flat table edges, wooden walls etc as these surfaces are porous. The suction power is surprisingly strong. And you get many of these mugs in different sizes in one package. However, it should be noted that the hooks are tiny. Also for the largest sizes. My swiss army knife suits them lol. Tiny hooks seem to limit their use. Considering the suction is exceptionally strong, I wish they had made a version with bigger hooks. It would make those little suction cups a lot more versatile. As for the suction cups, however, these are the strongest I've ever used on any compatible surface.
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