Open and Closed Sign for Door or Wall 12" x 8", Easy to Mount Plastic Sign, Open and Closed Sign for Business, Double-Sided PVC Sign. PVC (Polyvinyl Chloride) Is a Smooth, Rigid Plastic Sheet Material Perfect for Indoor and Outdoor Yard Signs or Real Estate Signs, or a Multitude of Other Advertising Purposes. We Use Only the Highest Quality Materials. Specifically, the Plastic and Colors We Use for Printing Keep Your Sign Strong and Beautiful.