The material I used is similar to screen protector for speakers but it is a rubber/plastic product. The place I got it from has since closed. I did not want a metal screen for obvious reasons, it will scratch the paint. The screens are held in place using electrical tape. It holds up very well as long as you don't try to stretch the tape when you put it on.It can be removed and using some wax remove the tape residue without affecting the paint. I still have some material left and my next idea is to use flexible magnetic tape. I will hot glue the tape to the edges of my screen then just stick them in place. I don't know if it will hold in highway traffic but now it will be easier to just remove them when driving at fast speeds. I only need the screens when I'm at home, same situation with oak tree and leavees.