Honestly !! Nickel! Easy to use! The Velcro is excellent! You go around with your window frame. Then you pull the canvas with small tools comes with, you do well to return the canvas in the Velcro. And then you cut what exceeds (better to use a real cutter, because the little cutter comes with not so good) ... Very good quality, super class! Too bad the white version is not found, because it would have interested me. In short it is an all in one kit (velcro + 2 + sheer small tools to fix and cut). My net is installed for more than two months, it does not move, nothing happens! I'm delighted!