First of all, you have to have a steel garage door for these to work. Last year we replaced our garage door but to save money we just got a full steel door. The price of one with windows was more than what we were willing to pay. After checking these magnetic garage door faux window panels I decided to give them a try. They come 32 in a package, each panel is pre-measured, 5 ¾” x 3 ¾”. I placed one on the garage door and they do cling quite well. I haven’t placed them entirely onto the garage door because it is winter now, so I will wait until spring. From the street, they will look exactly like the windowed garage doors. Up close (within a couple of feet) you will be able to tell that they are not, I’m okay with that. They are very to easy to install and a great way to update to a plain garage door.