Eventually I'll consider better materials. I do want everyone to know that this is no joke. I am absolutely loving everything about these headphones now.
The reason I used toilet paper was because it was the only thing I had available. When I got the idea to add a little bit of extra damping, I went scurrying about the house trying to find a suitable material. I couldn't find anything thinner than toilet paper. I may have some strips of silk lying around.