MFM Building Products 45W04 4 in. x 100ft Window Wrap - 9 Rolls Per Carton WindowWrap PSX-20 - Constructed of a tough, aluminized multi-layer polymer film and coated with specially formulated rubberized asphalt, patented WindowWrap stands up to UV rays like no other product. The durable aluminized surface prevents it from stretching during installation and allows it to withstand exposure without degradation for up to 6 months. Flexible and self-sealing around nails, screws, and staples. A release paper protects the asphalt and is removed as the tape is installed. Adheres to prepared substrates of plywood, OSB, masonry, aluminum, vinyl, steel, drywall, insulation board, and house wrap. May also be used as a weather-proof barrier between metal brackets and ACQ lumber. 25 mil. Features 4 in. x 100ft Window Wrap 9 Rolls Per Pack Specifications Dimension: 36 x 8 x 8 in. Cube: 2304 CoverageArea: 100 sq. ft. Material: Cross Linked Polymer Standards: Astm D1970 TemperatureRating: 55 Deg F Thickness: 45 Mil Usage: For Roofing, Patching, Gutter Repair, Flashing And General Waterproofing Width: 6 In Weight: 55 lbs