The Plexiglass Window Kit is easy to install, with each window snapping into place in less than 1 minute. A simple-but-ingenious bungee chord and barrel-lock system allows you to keep the window open at any height you'd like and close it securely. Plexiglass construction Bungee chord lift Barrel-lock system Snaps perfect into the Formex hunting blind Set of 4Included Windows (3) 10" x 33" windows (1) 10" x 20" door window Order today!