what are they made of so metal clips go up into the window tracks and attach like that

 

I was just on their website and I didnt see the raingurads...i did, however see the beautiful R Magic inverted scoop hood...i like

 

They are just like regular rain guards you see at the truck accesory places. Some kind of plastic, the clip is kinda rivoted in to the guard. It's a good design, fits nice and tight but can be removed if needed. I broke one of mine taking it off cause I was impatient and just pulled till I broke it. Need some patience and a flat blade screwdriver to push the teeth on the tabs out of the fabric. Look up inside where your window rides on the top of the door (with the window down) and you'll see material (fabric) the metal tabs have 2 hooks (teeth) that bite into it and hold the vent in place.