Designed For Any Size Door Opening. Plast World Strip Door is the most Economical Way to Close a Door Opening, The clear Flexible Strips Provide Unsurpassed Visibility For Safety In High Traffic Areas. The Edges Of The Strips are Rounded to Avoid The Danger Of being Cut, Concave-Convex Overlapping Pattern Enhances The Sealing Effect.The Plast World Strip Door is the Universal Low Cost Enclosure That Reduces Heat and Refrigeration Cost, Minimizes Energy Consumption, Provides Noise Control, and Increases Employee Comfort.