These went up without a hitch and I love the look of them and their room-darkening quality (fell over an ottoman after closing all of them in daylight. Lol.) They are more towards paper, than a fiber type fabric, but there is a plastic-ish back to them that provides reinforcement.  You do have to be careful not to compress them too much or they will stick to themselves.  This happened with the installation of the first shade and I needed gingerly separate it from itself.  Although the material could be a little stronger (in my opinion) the mechanism to lift and lower them works smoothly and feels of a higher quality.