Pemko S44D25 Adhesive-backed High Temperature Silicone Fin Seal Gasket. Designed to be installed on the perimeter of a door opening to slow/prohibit the passage of smoke, fire, weather, sound and dirt. Unaffected by sunlight, ozone and ultraviolet rays and is impervious to fungus and mildew. Designed for tighter frames, the 5/16" x 7/16" fin seal begins compressing at 5/16" and compresses to seal up to a 1/16" gap. Seal is extruded from high-temperature silicone. It has an effective range between -58F and 450F and demonstrates extremely low closing force. Dark Brown Color. 25' Roll.