The set of window vent visors came packaged very well and the individual pieces highly protected. Instructions need to be read a couple of times to really get the feel of whats required to install the vents, especially the front. I cleaned all the channels using a small spatula and cloth to remove any dirt or dust in the channels. The pack vents instructions were clear and precise. Before removing the vent adhesive, practice putting the rear visors in to the channel to understand what is required. These rear visor vents went in without any issue and are firm and strong. The front vents are tricky. Be very careful in locating and knowing where the window channel is. Be careful bending the product when putting it in and follow the instructions to the letter. The passenger vent locked in very well, but the drive side was a struggle. Once the driver side went in the end toward the rear of the window is loose, as though the vent is too short. I wobbles a bit even after sitting for 2 days. I gave a rating of 4 due to the issues I have with the driver side vent. JD