The Prym assortment offers specially-designed self-adhesive hooks for installing sash rods onto plastic windows. They can easily be adhered onto the grease-free, cleaned plastic frame. The adhesive can be removed again without any residue when uninstalled. As a result, no holes need to be drilled in the expensive window frame to decorate the window with a vitrage curtain. Each card contains 4 self-adhesive hooks with a metal stick.