I purchased 5 packs of these mylar blankets about 2 weeks ago to line the inside of a bedroom closet that is being repurposed for winter indoor fruit and veg growing. The blankets themselves are more like thin sheets of plastic, like regular Mylar if you're unfamiliar with them. For my purposes, these blades didn't have much play, which was a bit of a shame, but that probably wouldn't matter if used as advertised in a pinch. With good old duct tape it got the job done as far as I know and at a great price so I'd still recommend it if that's what you want to do.
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