Use our Suction Cup Light Clips to easily install your lights on Windows and Smooth Surfaces! These suction cups are specially designed to provide maximum suction strength to keep your lights straight and installed! These suction cups can be used both indoor and outdoor for your decorating needs! The installation process is simple, ensure that the desired area is cleaned with warm soapy water and dried. Then simply press the section cub onto the desired flat surface. You are now ready to hang your lights!