The panels are made of polystyrene. They are easy, but if you have glued them to the Steinhart. Normally you have to fix them with Styrofoam glue. But since I live in a rented apartment, I have attached these plates with wallpaper glue for heavy wallpapers. Conclusion The plates can be cut with a utility knife and outstanding are easy to process. It is ne real alternative to gypsum boards.