They are mostly made of fabric that has a sticky backing all over it. They also make a glue that makes them reusable, but I don't know how well it works even though I have some. I also have a friend that makes them out of sticky holographic paper which I also started making. If you make a slit in the design so they can be "coned" to cover the areola, it would help them to not wrinkle. Just my .02 from a pastie wearer. :rollside: