It is basically a plastic tube in rectangular shape glued on top of my rear windshield. It comes with a double sided tape (not 3M), and a little instruction manual with images, so you don’t apply your tape at the wrong side of the piece. I had to make sure it was in the center because it was a little bit smaller than the rear windshield, but overall it fitted nicely, looks sporty and im happy with it. Hopefully it stays there for a long time.