Comic book boards are white, acid free cardboard sheets used to protect collectible comic books. The comic book and one board are put in a protective plastic sleeve to prevent stains and folding. You can find them on Amazon in a couple of sizes and usually one hundred in a pack. They cost less than fifteen dollars. Look on Youtube or Google for ways to fold your fabric around them. I use plastic alligator clips to secure the fabric ends. So much better than rubber bands or pins. You end up with mini bolts of fabric that you place on a shelf just like books. Love being able to see all the fabrics at once.