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This is not secured by suction. It has a sticky suction cup appearing device which is what you would apply to the mirror or wall. It refused to stay where I put it and constantly falls down. I returned it.
Tried giant command hooks, but they eventually came loose. Installed these on the subway tile in a bathroom used by our 11 & 13 year old. They’ve been up for a month. Holds full-sized bath towels just fine. Looks nice, too. Would buy again.