Cork insulation tape is a polymer-based material containing butyl rubber, asphalt, and Granulated cork (55% by volume). it contains no fibers. This product adheres well to most clean, dry surfaces and to itself, making it possible to apply more than one layer without adding fasteners or adhesives. It is sufficiently soft and pliable to be molded around most fittings and connections. The material retains its flexibility and adhesion after prolonged exposure to UV and over a large temperature range. It has an indefinite service life if stored under normal Warehouse conditions. Black 1/8 in. X 2 in. X 30 ft.