Hard to paint a word picture, but the aft portion has a gasket that is on top of the card, but is permanently attached to the small quarter window. The forward part of the card is extremely fragile, and warps by breathing hard on it, which fouls the window run. The felt is made out of wet tissue paper with an overcooked spaghetti metal tab system. All of this pile of sh*t needs to be tight and exactly fitted or it binds on the window. Did I mention that you have to simultaneously twist the top of the card and bend the lip to have a snowball's chance in h*ll of fitting it?