Our 60/40 perforated vinyl allows you to display a window graphic to people outside a vehicle, and still allows those inside to see out. Typical applications are car and bus windows and retail store locations. The 60/40 designation means the material has 60% vinyl and 40% holes. The holes are 1mm in diameter. We print on the white face of the material, the reverse is black and has the adhesive. Typically the window perf is installed on the outside of the window. Perforated vinyl requires a very smooth surface such as glass for proper adhesion. It comes on a release paper. To obtain a smooth installation, it should be installed by wetting the surface and using a squeegee.