What is so special about Stakusit external roller blinds? This type of above-window roller blind is especially recommended for new buildings. The major advantage is the location of the roller blind box which ensures maximum access of light into the interior. As this roller blind is assembled together with the window, the incorporation of the above-window roller blind should be considered during the planning phase of the project. Aluminium lamellas filled with PUR foam when closed, form a self-contained area that completely shades the interior and creates a difficult to pass obstacle in the case of intruders.