2 panels. Each panel is 53" wide and 84" long. They have a sort of concealed tab top (see picture).
These block light really well, and keep heat where you want it (outside in summer or inside in winter). Nothing really wrong with them, just switching to a different color.
When I took them down, I noticed that there is some fading on the back side, and one of them has a tiny hole from when I had to pin them up above our baseboard heater.