They're not kidding when they say they can't break. We looked through many after many other brands of this article and finally decided to try a little to find something invincible. The problem is, if they're clear plastic, your eye can't see them, and then you step on them or kick them across the room. (I may or may not have thrown one when I kicked it for the 4,000th TIME). In any case, they hold up very well. We use them in the children's room to better direct the air into the room (as opposed to curtains, as the vents are right in front of the windows). A helpful tip if you're just going to keep kicking them is to apply strips of colored tape, such as washi tape or colored masking tape, over the vent cover. After that, they are no longer invisible.
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