Perfect for keeping those African mosquito's out! AND you can make the screens yourself with fiberglass screen, magnetic strip, decorative trim and a measuring tape.
If your windows have a metal framing:
measure the opening
cut your fiberglass screen (small enough to keep the bugs out and still let the breeze through) glue the magnetic strip around the edge of the screen
cut the ends at an angle (like you're making a big picture frame)
join the corners with glue or some kind of adhesive
On the side facing into the home: glue or velcro a decorative trim, shelving material or fabric