It takes a minute or two to figure out how to fold and assemble them, but once you get the hang of them they are simple and very effective. Protects the corners of all your frames, and the three different sizes not only fit different sized frames, but also help keep multiple smaller frames together in a set. I was able to stack 2-3 frames on top of each other and use those corners to hold them in place while moving. Five stars for satisfaction, but four stars because there's a lot of excess material (yes, at least recyclable!) that seems like it could be saved. I have a few boxes left over after using a dozen of these. Another product that makes sense without which it would be stupid to move.
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