Total Thickness: 25 mil Roll Sizes: 4" x 75' (2x4 construction), 6" x 75' (2x4 construction), 9" x 75' (2x6 construction) Packaging: Individually shrink-wrapped Composition: Butyl rubber adhesive; non-woven polyolefin backing; coated Kraft paper release UV Stability: Up to 180 days