Each panel is sold separately and are thick, but not overly thick and do a great job at blocking out light and the sun. The material is light and smooth grey on the outside with white on the inside. Each panel comes with smooth large built-in metal grommets for easy hanging and can fit curtain rods up to 1.5" in diameter. 
 They do collect cat hair it seems  very easily, but are great for blocking the light and Minimizing drafts. A little hard to iron out the wrinkles, but if you have a steamer it works best. As far as sound blockage I would say it depends on where you live and the amount of noise you're dealing with. It is not extremely noisy where I live, but I haven't noticed a difference yet as far as noise reduction goes. 
Overall these are great and look nice mixed with regular curtains on the inside.