9 mil 60/40 Perforated Window Film is a white semi-gloss perforated film. Each perforated hole measures 1.5mm in diameter and takes up 40% of the canvas, which means your custom message and image will be printed on the remaining 60%. The perforation allows you to view through the material, making it a great advertising tool for both exterior and interior windows and store displays. Window perfs allow you to advertise while still maintaining visibility and an open feel. Your design will be printed on the front/non-adhesive side, with the black adhesive on the back. The black adhesive back also allows you to create a tinted effect from one side. You may easily remove or reposition the window perfs.