We purchased screens from them about a year ago. They work very well at keeping the bugs out and are easy to install. I may not be remembering this correctly but I seem to recall that they involve double stick tape to fix the plastic frame onto the window frame and then a magnet and more tape to affix to the screen. However, after a year we do have a few frames that are now starting to "droop" a little which we will need to remove and reattach. Not sure if that is because we didn't clean the frame very well before "installation" or just the tape breaking down due to the elements.