Construction features two layers of material reinforced with a 14 ga. galvanized wire mesh. Roll-up screens have a built-in handle and tie strap. Flame resistant. FOB Shipping Point. Steel surcharge may apply. Cotton Duck - Material is treated with a permanent, paraffin-based finish, which resists water and mildew. Safety-Striped Vinyl - Resists fire, water, mildew, oils, alkalis and most acids. Yellow and Black striped.