Pemko S773BL17 Adhesive-backed High Temperature Silicone Triple 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. The 3/8" x 1/2" triple fin seal is designed for a gap of 1/16" Minimum on Beveled edge or 3/32" Minimum on Square edge door. (1/8" Optimum). Seal is extruded from high-temperature silicone. It has an effective range between -76������������������F and 446������������������F and demonstrates extremely low closing force. Black Color. 17' Roll.