These are fairly nice and the sticky back should stick to almost anything, it seems pretty sticky. These are metal numbers and very strong.
These metal numbers should stick to just about anything you need them to, the sticky pad on the back is very sticky. These are metal numbers, however, they are not solid. You can feel that space in the back under the sticky pad. They are pretty strong. I tried to bend them and couldn't. They look really nice, I imagine the gold color is plating on the numbers.
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