Pemko PK55D20 Adhesive-backed High Temperature Silicone Bulb 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 3/16" x 1/2" bulb seal begins compressing at 3/16" and compresses to seal up to a 1/16" gap. Stays flexible between -40 degrees (F) and 250 (F) degrees and demonstrates extremely low closing force. Dark Brown Color. 20' Roll.