Size: 9" Width X 50' LengthThickness: 35 MilMaterial: Polypropylene Top / Siliconized BottomUsed To Create A Weather-Tight Seal Around Windows And Doors, Joints In Sheathing, Sealing Around Skylights And As A Flashing In Residential ConstructionSelf-Adhering Membrane Consisting Of An SBS Rubberized Asphalt Compound Which Is Integrally Laminated To A Blue Engineered FilmExcellent Adhesion To Prepared Substrates Of Concrete, Block, Primed Steel, Aluminum Mill Finish, Anodized Aluminum, Galvanized Metal, Gypsum Board, Plywood And MoreImpermeable To Air, Moisture Vapor And WaterEasy To Install, Peel And Stick ApplicationMembrane Is Self-Sealing When Penetrated With Self-Tapping Screws Or Nails