They fit snugly into the air vent and close with a magnetic visor. The only negative I have to say is that you will probably need two to smell it. Even after I soaked the felt, I barely smelled it. It also dries pretty quickly in this GA heat. They look very nice and are great for people like me who have trouble with strong smells because you can choose any scent you want and how strong you want it to smell.
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