Prime-Line Products T 8752 Self-Adhesive Pile Weatherstrip for Windows & Doors, 18 ft., Grey, Owens Corning Used on windows & doors to improve energy efficiency by sealing gaps and leaks which allow outside air to enter, and inside conditioned air to escape 3/8 in. width x 1/4 in. height x 18 ft. length Constructed of grey pile fibers Woven pile weatherseal material