I bought these as replacements for sticky notes used to block the camera. These are great. they are very thin, and black like the rim of my computer, and slide easily to expose of hide camera lens. So far the adhesive has been good, allowing multiple slidies without working loose.I have not tried on my iphone, as I'm pretty sure in and out of pocket use would work to knock if off. But computers, tablet and kindles it's great.
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