But it's kind of hard to say without seeing them. That kind of fabric can be tricky, and you wouldn't want to ruin them! Is there a fabric or craft shop near you? They might have someone on staff who would know.
Maybe I'll try to take a couple of pictures of them over the weekend. I'm not describing them well at all, and I cannot remember the name of the company that made them. They were a gift from a very dear friend, and I do not want to wreck them, but I would also prefer that they not be condemned to hang on my wall, unused, forever.