Pemko S772D7 Dark Brown Silicon Smoke Seal Gasketing is used to seal the gap between a pair of doors. Protects against smoke, fire, air, sound and weather while staying unaffected by sunlight, ozone, and ultraviolet rays. Features adhesive backing for easy installation and a silicone finish to resist high temperatures. Self-extinguishing and nontoxic, impervious to fungus and mildew.