Avery Dennison® HP MPI 2728 Perforated Window Film 65/35 is a perforated flexible calendered film for use on exterior-mount one-way visual panels. Graphics printed on this material are visible from the front and “invisible” from the back when mounted on windows. HP MPI 2728’s 65.35 perforation pattern provides an open area of 35% allowing for the best possible image quality while still providing a one-way graphic panel. This film is intended for stationary windows.