Installation tip for these, or at least the Xenon brand. First thing, thrw the 2 sided tape they send in the trash. It sucks. Plus they do not send enough. Go buy some 3m. 2 days ago one of my Scoops was about to fall off. Luckly I caught it before I was going down the highway. I had to buy 3m like I said because they did not send enough of their tape with the Scoops. The one I put the 3m tape on is holding strong. I check the tape that was sent with the Xenon and it was not even sticky anymore. I placed 3m on the other Scoop and have been checking it everyday no probs. This is just my advice, but it might save you from a mental break down if your **** flys off your car.