I needed something sturdy and without strings because I camp with my dogs. Andy at
Windows Van Go in broomfield, CO. helped me install these. There is a spring loaded mounting bracket for the shades in a standard install. We used those in the existing holes on the window frame for all windiws except the back. It is so curved, Andy installed a flat aliminum bar across the top of the windiw and installed the standard bracket to that bar.
In a home installation, there are neodymium magnet rollers that attract the bottom of the shade to hold it closed. I attached small magnets to the bottom of my shade bar and still use the magnet rollers to hold the shade down and keep it from bouncing during travel. I have several long trips on these shades and I couldn't be happier.