Avery HP MPI 2528 Perforated Window Film 50/50 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 2528’s 50/50 perforation pattern provides an open area of 50% allowing for the best possible visibility through a one-way graphic panel. This film is intended for vehicle windows or applications where visibility through the graphic is important.