No. They were made out of a 48" x 25' roll of Reflectix (bought at Lowes). That was enough material to make shades for all of the side windows and the back windshield, as well as mess up two side shades as I was figuring out what I was doing.
I guess I'd say that they are secured by friction. Cover the outside of the window with a piece of butcher/kraft paper large enough to cover the entire window, with about a 3" overhang all the way around. Secure the paper with a few pieces of tape along the top. Then starting with the top, take your finger and press the paper into the edge where the glass meets the window frame. Trace that edge with a pen or pencil all the way around to make a template.
Cut out the template and transfer the shape to your piece of Reflectix (ballpoint pen seemed to work well). Then, when you're cutting the Reflectix, cut it just to the outside of your pen mark. It should press into the inside window frame with the edges slightly scrunched. Trim as needed. Once you have one side window fitted, use that shade as your template for the opposite window (trace and cut along the line this time).